AEROSOL GENERATING ELEMENT FOR USE IN AN AEROSOL GENERATING ARTICLE OR SYSTEM

Abstract

An aerosol generating element is provided for use in an aerosol generating article or system. The aerosol generating element comprises: a solid continuous matrix structure; and an aerosol generating formulation dispersed within the solid continuous matrix structure. The aerosol generating formulation is trapped within the solid continuous matrix structure and can be released from the solid continuous matrix structure upon heating of the aerosol generating element. The solid continuous matrix structure is a polymeric matrix comprising one or more matrix-forming polymers, and the aerosol generating formulation dispersed within the solid continuous matrix structure comprises at least one alkaloid or cannabinoid compound and at least 30 percent by weight of a polyhydric alcohol.

Description

AEROSOL GENERATING ELEMENT FOR USE IN AN AEROSOL GENERATING ARTICLE OR SYSTEM The present invention relates to an aerosol generating element for particular use in an aerosol generating article or system. The present invention further relates to an aerosol generating article or system comprising such an aerosol generating element. Aerosol-generating articles are known in the art in which an aerosol-generating substrate, such as a tobacco-containing substrate, is heated rather than burned. Typically, in such articles, an aerosol is generated by the transfer of heat from a heat source to a physically separate aerosol-generating material or substrate, which may be located in contact with, within, around, or downstream of the heat source. During use of the aerosol-generating article, volatile compounds are released from the aerosol-generating substrate by the heat transfer from the heat source and are carried in the air drawn through the article. As the released compounds cool, they condense to form an aerosol. A number of prior art documents describe aerosol-generating devices for the consumption of aerosol-generating articles. Such devices include, for example, electrically heated aerosol-generating devices in which an aerosol is generated by the transfer of heat from one or more electrical heating elements of the aerosol-generating device to the aerosol-generating substrate of a heated aerosol-generating article. In the past, substrates for heated aerosol-generating articles have often been produced using randomly oriented fragments, strands, or strips of tobacco material. Alternatively, in International Patent Application WO 2012 / 164009, bars for heated aerosol-generating articles formed from crinkled sheets of tobacco material are described as examples. Rfrncnn / zznz / E / YiAi International patent application WO 2011 / 101164 describes alternative bars for heated aerosol-generating articles formed from strands of homogenized tobacco material, which can be formed by casting, rolling, calendering, or extruding a mixture comprising particulate tobacco and at least one aerosol former to form a sheet of homogenized tobacco material. In alternative embodiments, the bars of WO 2011 / 101164 can be formed from strands of homogenized tobacco material obtained by extruding a mixture comprising particulate tobacco and at least one aerosol former to form continuous lengths of homogenized tobacco material. Substrates for heated aerosol-generating articles typically further comprise an aerosol former, i.e., a compound or mixture of compounds that, during use, facilitates aerosol formation and is preferably essentially resistant to thermal degradation at the operating temperature of the aerosol-generating article. Examples of suitable aerosol formers include, but are not limited to: polyhydric alcohols, such as propylene glycol, triethylene glycol, 1,3-butanediol, and glycerin; esters of polyhydric alcohols, such as mono-, di-, or triacetate of glycerol; and aliphatic esters of mono-, di-, or polycarboxylic acids, such as dimethyl dodecanedioate and dimethyl tetradecanedioate. Alternative forms of nicotine-comprising substrates have also been described. For example, liquid nicotine compositions, often referred to as e-liquids, have been proposed. These liquid compositions can be heated, for instance, by means of an electrically resistive filament wound around an aerosol-generating device. Substrates of this type may require particular care in the manufacture of the containers that hold the liquid composition in order to avoid inconvenient leaks. It has previously been proposed to provide an encapsulated nicotine formulation for use as an aerosol-generating substrate. However, it has been found that the Encapsulating nicotine formulations is challenging. One reason for this is the preference for hydrophilic aerosol formers, such as glycerin and propylene glycol, in nicotine formulations, which makes it difficult to use many commonly used encapsulation materials, which are also hydrophilic. With existing encapsulation techniques, it has generally been found that such a high level of hydrophilic encapsulation material is required to produce a stable product that an insufficient payload of the nicotine formulation is provided. While hydrophobic encapsulation materials are available, they often require processing at relatively high temperatures, which can lead to degradation of the nicotine formulation during manufacturing. During use, the temperatures required to generate an aerosol from the nicotine formulation can be high enough to cause degradation of the hydrophobic encapsulation material. This can result in the release of undesirable compounds in the resulting aerosol, which may adversely affect its sensory profile. It has also been proposed to provide a gel composition comprising nicotine that is adapted to generate a nicotine-containing aerosol upon heating. By way of example, WO 2018 / 019543 describes a thermoreversible gel composition, i.e., a gel that becomes fluid when heated to a melting temperature and solidifies again into a gel at a freezing temperature. WO 2018 / 019543 describes the provision of such a gel within the housing of a cartridge. The cartridge can be discarded and replaced when the gel has been consumed. For the gel composition to generate a satisfactory amount of aerosol during use, it is desirable that the gel composition include a significant amount of an aerosol former, such as glycerol.However, due to the plasticizing qualities of glycerol, it has been difficult to provide a gel composition that is capable of providing a good supply of aerosol during use and, at the same time. Rfrncnn / zznz / E / YiAi time, geometrically stable, i.e., a gel composition that does not undergo significant volume loss as it solidifies and settles into a film. Therefore, it would be convenient to provide a new alternative encapsulated aerosol generating formulation, such as an aerosol generating element that encapsulates a nicotine-containing formulation, providing an improved encapsulated substrate that has increased stability and minimal leakage of the aerosol generating formulation. It would also be convenient to provide such an aerosol-generating element that is easy to handle to facilitate the manufacture and packaging of aerosol-generating articles comprising one or more aerosol-generating elements. It would also be convenient to provide such an encapsulated aerosol-generating formulation with a minimal encapsulation structure to provide efficient aerosol delivery, particularly when heated to a temperature in the range of approximately 150°C to approximately 350°C. This description relates to an aerosol generating element for use in an aerosol generating article or system. The aerosol generating element may comprise a solid continuous matrix structure and an aerosol generating formulation dispersed within the solid continuous matrix structure. The aerosol generating formulation may be trapped within the solid continuous matrix structure and released from the solid continuous matrix structure upon heating of the aerosol generating element. The solid continuous matrix structure may be a polymeric matrix comprising one or more matrix-forming polymers. The aerosol generating formulation dispersed within the solid continuous matrix structure may comprise at least one alkaloid or cannabinoid compound. The aerosol generating formulation dispersed within the solid continuous matrix structure may comprise a polyhydric alcohol.The polyhydric alcohol may represent at least 30 percent by weight based on the total weight of the aerosol generating element. Rfrncnn / zznz / E / YiAi Furthermore, this description refers to an aerosol generating article comprising one or more aerosol generating elements as described above. In addition, this description refers to an aerosol generating system comprising one or more aerosol generating elements or an aerosol generating article as described above and an electrically operated aerosol generating device comprising a heating element and a heating chamber configured to receive the aerosol generating element or article such that the aerosol generating element is heated in the heating chamber by the heating element. According to the present invention, an aerosol generating element is provided for use in an aerosol generating article or system, wherein the aerosol generating element comprises: a solid continuous matrix structure; and an aerosol generating formulation dispersed within the solid continuous matrix structure, wherein the aerosol generating formulation is trapped within the solid continuous matrix structure and can be released from the solid continuous matrix structure upon heating of the aerosol generating element;wherein the solid continuous matrix structure is a polymeric matrix comprising one or more matrix-forming polymers, and wherein the aerosol-generating formulation dispersed within the solid continuous matrix structure comprises at least one alkaloid or cannabinoid compound and a polyhydric alcohol, wherein the polyhydric alcohol represents at least 30 percent by weight based on the total weight of the aerosol-generating element. The term aerosol generating article is used herein with reference to the invention to describe an article in which an aerosol generating substrate is heated to produce and deliver an aerosol to a consumer. As used herein, the term “aerosol generating substrate” indicates a substrate capable of releasing volatile compounds when heated to generate an aerosol. Rfrncnn / zznz / E / YiAi The term aerosol generating element is used herein with reference to the invention to describe a self-contained, discrete aerosol generating substrate element capable of releasing volatile compounds when heated to generate an aerosol. The aerosol generated from the aerosol-generating formulation of aerosol-generating elements described herein is a dispersion of solid particles or liquid droplets (or a combination of solid particles and liquid droplets) in a gas. The aerosol may be visible or invisible and may include vapors of substances that are normally liquid or solid at room temperature, as well as solid particles or liquid droplets, or a combination of solid particles and liquid droplets. An aerosol generating element according to the present invention can be used as an aerosol generating substrate of an aerosol generating article. A traditional cigarette is lit when a user applies an ignition source to one end of the cigarette and draws air through the other. The localized heat from the flame and the oxygen in the air drawn through the cigarette causes the end of the cigarette to ignite, and the resulting combustion produces inhalable smoke. In contrast, in heated aerosol-generating articles, an aerosol is generated by heating a flavor-generating substrate, such as a tobacco-based substrate or a substrate containing an aerosol former and a flavoring. Known heated aerosol-generating articles include, for example, electrically heated aerosol-generating articles and aerosol-generating articles in which an aerosol is generated by transferring heat from a fuel element or heat source to a physically separate aerosol-forming material. For example, aerosol generating articles according to the invention may find particular application in aerosol generating systems comprising an electrically heated aerosol generating device having an internal heater adapted to supply heat to one or more elements of the aerosol generating substrate Rfrncnn / zznz / E / YiAi discrete. As used herein with reference to the present invention, the term “aerosol generating device” is used to describe a device comprising a heating element that interacts with one or more aerosol generating elements according to the invention to produce an aerosol. During use, volatile compounds are released from the aerosol generating element or elements by heat transfer and are carried in the air drawn through the aerosol generating article. As the released compounds cool, they condense to form an aerosol that is inhaled by the consumer. Substrates for heated aerosol-generating articles typically comprise an “aerosol former,” that is, a compound or mixture of compounds that, during use, facilitates aerosol formation and is preferably essentially resistant to thermal degradation at the operating temperature of the aerosol-generating article. Examples of suitable aerosol formers include: polyhydric alcohols, such as propylene glycol, 1,3-butanediol, and glycerin; esters of polyhydric alcohols, such as glycerol monoacetate, dicetate, or triacetate; and aliphatic esters of monocarboxylic, dicarboxylic, or polycarboxylic acids, such as dimethyl dodecanedioate and dimethyl tetradecanedioate. The polyhydric alcohol of the aerosol-generating article of the invention is also an aerosol former in the sense described above. As used in the present description with reference to the present invention, the term aerosol generating formulation refers to a formulation comprising a plurality of aerosol generating formulation components, which upon heating the aerosol generating element will volatilize to produce an aerosol. As used herein with reference to the present invention, the term matrix-forming polymer refers to a polymer-shaped encapsulation material that is capable of producing a three-dimensional polymer matrix as a result of crosslinking when the polymer-forming matrix is ​​brought into contact with a crosslinking solution of Rfrncnn / zznz / E / YiAi multivalent cations. The resulting polymer matrix is ​​capable of trapping and retaining the aerosol-generating formulation within its crosslinked structure. The nature of the crosslinked polymer matrix will be discussed in more detail below. As briefly described above, in contrast to existing aerosol generating elements, an aerosol generating element according to the present invention comprises a solid continuous matrix structure and an aerosol generating formulation dispersed within the solid continuous matrix structure. More specifically, the aerosol generating formulation is trapped within the solid continuous matrix structure and can be released from the solid continuous matrix structure by heating the aerosol generating element to a predetermined temperature. Without intending to impose any theory, it is understood that in an aerosol generating element according to the present invention, a three-dimensional polymer matrix structure is formed by crosslinking, and the aerosol generating formulation is retained within the polymer matrix structure. This is, in particular, in contrast to existing core / shell structures where the contents of the core are released when the shell ruptures. In an aerosol generating element according to the present invention, the solid continuous matrix structure is a polymeric matrix comprising one or more matrix-forming polymers. Furthermore, the aerosol generating formulation dispersed within the solid continuous matrix structure comprises at least one alkaloid or cannabinoid compound, and at least 30 percent by weight of a polyhydric alcohol. Advantageously, the invention provides an encapsulated aerosol-generating formulation that has a significantly lower content of encapsulating material (corresponding to the one or more matrix-forming polymers of the solid continuous matrix structure) compared to previously available substrates. As such, the levels of the aerosol-generating formulation components, such as the alkaloid or cannabinoid and the polyhydric alcohol, can be advantageously maximized within the generating element. Rfrncnn / zznz / E / YiAi aerosol. Furthermore, the reduction in the proportion of encapsulation material required allows for more efficient aerosol generation after heating, as less heat is supplied to the aerosol generating element to raise the temperature of the encapsulation material. The continuous, solid, polymer-based matrix of aerosol-generating articles according to the present invention provides an inert encapsulation structure for retaining and immobilizing the aerosol-generating formulation, which is stable when the aerosol-generating element is heated during use. The inventors have found that, when heated to temperatures in the range of 150°C to 350°C, the aerosol-generating elements according to the present invention release an aerosol as they undergo a significant weight loss. However, this weight loss is not accompanied by an equally significant volume loss. Without intending to impose any theory, it is understood that, upon heating, the components of the aerosol-generating formulation, originally dispersed and trapped within the continuous, solid matrix structure, essentially vaporize and are released.On the other hand, the components of the solid continuous matrix are essentially unaffected, and the solid continuous matrix only partially shrinks while essentially retaining its 3D structure. As such, encapsulating the aerosol-generating formulation within the polymer-based matrix advantageously provides minimal or no adverse effects on the sensory profile of the aerosol generated after heating. The aerosol generating element of the present invention has been found to advantageously provide a controlled aerosol delivery. Furthermore, the aerosol delivery profile can be easily adjusted by modifying parameters of the aerosol generating element such as its size, shape, structure, and formulation. Rfrncnn / zznz / E / YiAi aerosol. The invention advantageously provides an aerosol generating element that has the form of a discrete, self-contained solid object that is sufficiently stable and robust to be easily processed and introduced into an aerosol generating article using existing methods and techniques. Furthermore, the aerosol generating elements according to the present invention can be prepared using a cost-effective method that can be performed with existing equipment, as will become clear from the following description thereof. Moreover, the aerosol generating elements according to the present invention can be prepared using a method that can be easily incorporated into existing production lines for the manufacture of aerosol generating articles. The aerosol generating elements according to the present invention can be prepared from a matrix precursor solution and components of an aerosol generating formulation. By way of example, in a method of manufacturing an aerosol generating element according to the invention, a matrix precursor solution comprising a matrix-forming polymer in water can be provided. Preferably, the matrix polymer solution comprises at least approximately 35 percent by weight of water, more preferably at least approximately 40 percent by weight of water. This water level ensures that the matrix-forming polymer is sufficiently dissolved to provide a homogeneous solution. The matrix-forming polymer can be a single polymer or a combination of two or more polymers, where one or more polymers are capable of forming a crosslinked matrix through an ionotropic gelation mechanism in a crosslinking solution of multivalent cations. The crosslinking of the matrix-forming polymer is achieved by the reaction of the polymer with multivalent cations in the crosslinking solution, which form salt bridges to crosslink the polymer molecules. Suitable matrix-forming polymers would be known to experts and include, but are not limited to, alginate, pectin, and hydroxyethyl methacrylate (HEMA). Rfrncnn / zznz / E / YiAi N-(2-hydroxypropyl) methacrylate (HPMA), N-vinyl-2-pyrrolidone (NVP), N-isopropylacrylamide (NIPAMM), vinyl acetate (VAc), acrylic acid (AA), methacrylic acid (MAA), polyethylene glycol acrylate / methacrylate (PEGA / PEGMA) and polyethylene glycol diacrylate / dimethacrylate, (PEGDA / PEGDMA). Preferably, the matrix-forming polymer comprises one or more polysaccharides, such as alginate or pectin, or a combination thereof. Particularly preferably, the matrix-forming polymer is alginate. Polysaccharides are particularly suitable for use in the present invention since they can be made water-insoluble and heat-set through crosslinking and are tasteless. Therefore, there is no adverse impact on the sensory properties of the aerosol generated from the aerosol-generating element. Alternative matrix-forming polymers suitable for use in methods according to the invention include, but are not limited to, chitosan, fibrin, collagen, gelatin, hyaluronic acid, dextran, and combinations thereof. In preferred embodiments, the matrix-forming polymer is a single polysaccharide. Even more preferably, the matrix-forming polymer is alginate. In other words, in such particularly preferred embodiments, the solid continuous matrix structure is an alginate polymer matrix. In a first step, a plurality of aerosol-generating formulation components can be added to the matrix precursor solution to form an aerosol-generating solution, wherein the aerosol-generating formulation components comprise at least one alkaloid or cannabinoid compound and a polyhydric alcohol. As used herein when describing a method for preparing aerosol-generating elements according to the invention, the term aerosol-generating solution denotes a solution of the aerosol-generating formulation components and the matrix precursors in a suitable solvent. Rfrncnn / zznz / E / YiAi Suitable polyhydric alcohols for use in the aerosol generating element include, but are not limited to, propylene glycol, triethylene glycol, 1,3-butanediol, and glycerin. Preferably, in an aerosol generating element produced according to the invention, the polyhydric alcohol is selected from the group consisting of glycerin, propylene glycol, and combinations thereof. In particularly preferred embodiments, the polyhydric alcohol is glycerin. Preferably, the alkaloid is selected from the group consisting of nicotine, anatabine, and combinations thereof. It may be advantageous to control the viscosity of the aerosol-generating solution. This may include controlling the viscosity of the matrix polymer solution as the aerosol-generating formulation components are added. For example, depending on the technique used to produce the discrete portion of the aerosol-generating solution in the later stage of the method, it may be preferable to provide the aerosol-generating solution with a viscosity within a specific range. Different techniques are likely to be facilitated by different viscosity solutions, and therefore, an appropriate viscosity should be determined depending on the technique used. As an example, when the discrete portion of the aerosol-generating solution is produced in a gravity drop-off process, the viscosity of the solution is preferably kept below approximately 5000 mPa·s (milliPascal-seconds).This allows droplets of the aerosol-generating solution to form by gravity and also allows the beads to achieve a stable shape in the crosslinking solution before crosslinking hardens the solution and fixes the final shape of the aerosol-generating element. In certain cases, to control the viscosity of the aerosol-generating solution, the pH of the matrix polymer solution can preferably be controlled while adding the aerosol-generating formulation components. This is because, for some matrix polymer solutions, pH can affect viscosity. For example, in embodiments of the invention where the matrix-forming polymer comprises alginate, it is Rfrncnn / zznz / E / YiAi It is preferable to maintain the pH of the solution above pH 4. This is intended to prevent any gelation of the alginate, which can occur at pH levels below pH 4, for example, due to hydrogen bonding. Such gelation at a low pH would cause an inconvenient increase in the viscosity of the aerosol-generating solution, making it difficult to use certain techniques, such as gravity drop, to form the aerosol-generating element. Alternatively or additionally, the viscosity of the aerosol-generating solution can be controlled by adjusting the solution's concentration. For example, the proportion of water in the aerosol-generating solution can be adjusted to regulate the viscosity. Preferably, the aerosol-generating solution comprises at least approximately 35 percent water by weight to maintain suitable viscosity. Particularly preferably, the aerosol-generating solution comprises between approximately 35 percent and approximately 65 percent water by weight. A suitable test method for measuring viscosity is described in ASTM D2983-19, “Standard Test Method for Low Temperature Viscosity of Automatic Transmission Fluids, Hydraulic Fluids, and Lubricants using a Rotational Viscometer.” In a second step, a discrete portion of the aerosol-generating solution can be formed. In a third step, the formed discrete portion of the aerosol-generating solution can be added to a crosslinking solution of multivalent cations to crosslink the matrix-forming polymer, thereby forming an aerosol-generating element having a continuous polymer matrix structure and an aerosol-generating formulation comprising the aerosol-generating components dispersed within the continuous polymer matrix. Preferred multivalent cations include calcium, iron, aluminum, manganese, copper, zinc, or lanthanum. A particularly preferred salt is calcium chloride. In certain preferred embodiments of the invention where the aerosol-generating solution comprises an acid, the calcium salt provided in the crosslinking solution can advantageously be a salt of the same acid. For example, in embodiments where the solution Rfrncnn / zznz / E / YiAi aerosol generator comprises lactic acid, the crosslinking solution may advantageously comprise calcium lactate. When the aerosol generating solution contains nicotine, the acid in the aerosol generating solution forms a nicotine salt with the nicotine. Using a calcium salt corresponding to the acid in the aerosol generating solution therefore provides the same salt in the crosslinking solution as in the aerosol generating solution. This, in turn, advantageously limits the diffusion of nicotine salts from the aerosol generating solution into the crosslinking solution during the crosslinking step. Therefore, a higher concentration of the nicotine salt can be retained within the aerosol generating element. Furthermore, any potential waste of nicotine and acid during the production of the aerosol generating element can be reduced. Preferably, the crosslinking solution further comprises a polyhydric alcohol, which is the same as the polyhydric alcohol selected as a component of the aerosol-generating formulation. It has been found that the inclusion of the polyhydric alcohol in the crosslinking solution limits the diffusion of the polyhydric alcohol from the aerosol-generating solution into the crosslinking solution during the crosslinking step. This advantageously allows for a higher concentration of the polyhydric alcohol to be retained within the aerosol-generating element than was previously possible. In a fourth step, the aerosol generating element can be removed from the crosslinking solution and dried. As briefly described above, in the aerosol generating elements according to the present invention, the solid continuous matrix structure is a polymeric matrix comprising one or more matrix-forming polymers. Suitable matrix-forming polymers are known to those skilled in the art. Rfrncnn / zznz / E / YiAi Preferably, the one or more matrix-forming polymers include one or more polysaccharides. More preferably, the one or more matrix-forming polymers include at least one of alginate and one of pectin. Polysaccharides are particularly suitable for use in the present invention, since they can be made water-insoluble and thermoset through crosslinking and are tasteless. Therefore, there is no adverse impact on the sensory properties of the aerosol generated from the aerosol-generating element. In preferred embodiments, the matrix-forming polymer is a single polysaccharide. Even more preferably, the matrix-forming polymer is alginate. In other words, in such particularly preferred embodiments, the solid continuous matrix structure is an alginate polymer matrix. The use of alginate as the sole matrix-forming polymer is preferred because alginate has the ability to promote the rapid formation of solid, insoluble aerosol-generating elements. More specifically, the inventors have found that using alginate as the sole matrix-forming polymer, particularly in the amounts described below, advantageously provides aerosol-generating elements that are stable and self-sustaining and can accommodate higher concentrations of polyhydric alcohol within the polymer matrix. Furthermore, compared to other formulations, using alginate as the sole matrix-forming polymer, particularly in the amounts described below, has been found to allow the formation of larger aerosol-generating elements, for example, in the form of spherical or near-spherical beads with larger diameters. Preferably, in an aerosol generating element according to the present invention, the solid continuous matrix structure is an alginate polymer matrix, and the aerosol generating element comprises at least approximately 1 percent by weight of alginate. More preferably, the aerosol generating element comprises at least Rfrncnn / zznz / E / YiAi approximately 1.5 percent by weight of alginate. Even more preferably, the aerosol generating element comprises at least approximately 2 percent by weight of alginate. In particularly preferred embodiments, the aerosol generating element comprises at least approximately 3 percent by weight of alginate. Preferably, in an aerosol generating element according to the present invention, the solid continuous matrix structure is an alginate polymer matrix, and the aerosol generating element comprises less than or equal to approximately 10 percent by weight of alginate. More preferably, the aerosol generating element comprises less than or equal to approximately 8 percent by weight of alginate. Even more preferably, the aerosol generating element comprises less than or equal to approximately 6 percent by weight of alginate. In particularly preferred embodiments, the aerosol generating element comprises less than or equal to approximately 5 percent by weight of alginate. In some embodiments, the solid continuous matrix structure is an alginate polymer matrix, and the aerosol-generating element comprises from approximately 1 wt% to approximately 10 wt% alginate. Preferably, the aerosol-generating element comprises from approximately 1.5 wt% to approximately 10 wt% alginate, more preferably from approximately 2 wt% to approximately 10 wt% alginate, and even more preferably from approximately 3 wt% to approximately 10 wt% alginate. In other embodiments, the solid continuous matrix structure is an alginate polymer matrix, and the aerosol-generating element comprises from approximately 1 percent to approximately 8 percent by weight of alginate. Preferably, the aerosol-generating element comprises from approximately 1.5 percent to approximately 8 percent by weight of alginate, more preferably from approximately Rfrncnn / zznz / E / YiAi percent by weight to approximately 18 percent by weight of alginate, even more preferably from approximately 3 percent by weight to approximately 8 percent by weight of alginate. In additional embodiments, the solid continuous matrix structure is an alginate polymer matrix, and the aerosol-generating element comprises from approximately 1 wt% to approximately 6 wt% alginate. Preferably, the aerosol-generating element comprises from approximately 1.5 wt% to approximately 6 wt% alginate, more preferably from approximately 2 wt% to approximately 6 wt% alginate, and even more preferably from approximately 3 wt% to approximately 6 wt% alginate. Alternative matrix-forming polymers suitable for use in aerosol generating elements according to the invention include, but are not limited to, chitosan, fibrin, collagen, gelatin, hyaluronic acid, dextran, and combinations thereof. Other alternative matrix-forming polymers suitable for use in aerosol generating elements according to the invention may be constructed from one or more of the following monomers and polymers: hydroxyethyl methacrylate (HEMA), N-(2-hydroxypropyl) methacrylate (HPMA), N-vinyl-2-pyrrolidone (NVP), N-isopropylacrylamide (NIPAMM), vinyl acetate (VAc), acrylic acid (AA), methacrylic acid (MAA), polyethylene glycol acrylate / methacrylate (PEGA / PEGMA), and polyethylene glycol diacrylate / dimethacrylate (PEGDA / PEGDMA). As defined above, an aerosol generating element according to the invention comprises a polyhydric alcohol as a component of the aerosol generating formulation dispersed within the solid continuous matrix structure. More specifically, the polyhydric alcohol content in the aerosol generating formulation represents at least 30 percent by weight based on the total weight of the aerosol generating element. Rfrncnn / zznz / E / YiAi The polyhydric alcohol acts as the aerosol former of the aerosol generating element. Suitable polyhydric alcohols for use in the aerosol generating element include, but are not limited to, propylene glycol, triethylene glycol, 1,3-butanediol, and glycerin. Preferably, in an aerosol generating element according to the invention, the polyhydric alcohol is selected from the group consisting of glycerin, propylene glycol, and combinations thereof. In particularly preferred embodiments, the polyhydric alcohol is glycerin. Preferably, the polyhydric alcohol content in the aerosol-generating formulation represents at least approximately 35 percent by weight based on the total weight of the aerosol-generating element. Therefore, an aerosol-generating element according to the present invention comprises at least approximately 35 percent by weight of polyhydric alcohol. Even more preferably, the polyhydric alcohol content in the aerosol-generating formulation represents at least 40 percent by weight based on the total weight of the aerosol-generating element. As such, an aerosol-generating element according to the present invention comprises at least approximately 40 percent by weight of polyhydric alcohol. In particularly preferred embodiments, the polyhydric alcohol content in the aerosol-generating formulation represents at least approximately 45 percent by weight based on the total weight of the aerosol-generating element. More preferably, the polyhydric alcohol content in the aerosol-generating formulation represents at least approximately 50 percent by weight based on the total weight of the aerosol-generating element. Even more preferably, the polyhydric alcohol content in the aerosol-generating formulation represents at least approximately 55 percent by weight based on the total weight of the aerosol-generating element. Most preferably, the polyhydric alcohol content in the aerosol-generating formulation represents at least approximately 60 percent by weight or at least approximately 65 percent by weight. Rfrncnn / zznz / E / YiAi at least approximately 70 percent by weight based on the total weight of the aerosol generating element. Typically, in an aerosol generating element according to the invention, the polyhydric alcohol content in the aerosol generating formulation represents less than or equal to approximately 95 percent by weight based on the total weight of the aerosol generating element. Preferably, in an aerosol generating element according to the invention, the polyhydric alcohol content in the aerosol generating formulation is less than or equal to approximately 90 percent by weight based on the total weight of the aerosol generating element. More preferably, the polyhydric alcohol content in the aerosol generating formulation is less than or equal to approximately 85 percent by weight based on the total weight of the aerosol generating element. Even more preferably, the polyhydric alcohol content in the aerosol generating formulation is less than or equal to approximately 80 percent by weight based on the total weight of the aerosol generating element. In some embodiments, the polyhydric alcohol content in the aerosol-generating formulation ranges from approximately 30 percent to approximately 95 percent by weight based on the total weight of the aerosol-generating element. Preferably, the polyhydric alcohol content in the aerosol-generating formulation ranges from approximately 35 percent to approximately 95 percent by weight based on the total weight of the aerosol-generating element. More preferably, the polyhydric alcohol content in the aerosol-generating formulation ranges from approximately 40 percent to approximately 95 percent by weight based on the total weight of the aerosol-generating element. Even more preferably, the polyhydric alcohol content in the aerosol-generating formulation ranges from approximately 45 percent to approximately 95 percent by weight based on the total weight of the aerosol-generating element. Rfrncnn / zznz / E / YiAi aerosol. In particularly preferred embodiments, the polyhydric alcohol content in the aerosol-generating formulation represents from approximately 50 percent by weight to approximately 95 percent by weight based on the total weight of the aerosol-generating element, more preferably from approximately 55 percent by weight to approximately 95 percent by weight based on the total weight of the aerosol-generating element, and even more preferably from approximately 60 percent by weight to approximately 95 percent by weight based on the total weight of the aerosol-generating element. In the most preferred embodiments, the polyhydric alcohol content in the aerosol-generating formulation represents from approximately 65 percent by weight to approximately 95 percent by weight or even from approximately 70 percent by weight to approximately 95 percent by weight based on the total weight of the aerosol-generating element. In these embodiments, the aerosol-generating element may comprise from approximately 30 wt% to approximately 95 wt% of polyhydric alcohol and preferably from approximately 35 wt% to approximately 95 wt% of polyhydric alcohol. More preferably, the aerosol-generating element comprises from approximately 40 wt% to approximately 95 wt% of polyhydric alcohol. Even more preferably, the aerosol-generating element comprises from approximately 45 wt% to approximately 95 wt% of polyhydric alcohol.In particularly preferred embodiments, the aerosol generating element comprises from approximately 50 percent by weight to approximately 95 percent by weight of polyhydric alcohol, preferably from approximately 55 percent by weight to approximately 95 percent by weight of polyhydric alcohol, more preferably from approximately 60 percent by weight to approximately 95 percent by weight of polyhydric alcohol, even more preferably from approximately 65 percent by weight to approximately 95 percent by weight of polyhydric alcohol, with the highest preference being. Rfrncnn / zznz / E / YiAi approximately 70 percent by weight to approximately 95 percent by weight of polyhydric alcohol. In other embodiments, the polyhydric alcohol content in the aerosol-generating formulation ranges from approximately 30 percent to approximately 90 percent by weight, based on the total weight of the aerosol-generating element. Preferably, the polyhydric alcohol content in the aerosol-generating formulation ranges from approximately 35 percent to approximately 90 percent by weight, based on the total weight of the aerosol-generating element. More preferably, the polyhydric alcohol content in the aerosol-generating formulation ranges from approximately 40 percent to approximately 90 percent by weight, based on the total weight of the aerosol-generating element. Even more preferably, the polyhydric alcohol content in the aerosol-generating formulation ranges from approximately 45 percent to approximately 90 percent by weight, based on the total weight of the aerosol-generating element.In particularly preferred embodiments, the polyhydric alcohol content in the aerosol-generating formulation represents approximately 50 wt% to approximately 90 wt% based on the total weight of the aerosol-generating element, more preferably approximately 55 wt% to approximately 90 wt% based on the total weight of the aerosol-generating element, and even more preferably approximately 60 wt% to approximately 90 wt% based on the total weight of the aerosol-generating element. In the most preferred embodiments, the polyhydric alcohol content in the aerosol-generating formulation represents approximately 65 wt% to approximately 90 wt% or even approximately 70 wt% to approximately 90 wt% based on the total weight of the aerosol-generating element. In these embodiments, the aerosol generating element according to the present invention may comprise from approximately 30 percent by weight up to Rfrncnn / zznz / E / YiAi approximately 90 percent by weight of a polyhydric alcohol. Preferably, the aerosol generating element comprises from approximately 35 percent by weight to approximately 90 percent by weight of polyhydric alcohol. More preferably, the aerosol generating element comprises from approximately 40 percent by weight to approximately 90 percent by weight of polyhydric alcohol. Even more preferably, the aerosol generating element comprises from approximately 45 percent by weight to approximately 90 percent by weight of polyhydric alcohol.In particularly preferred embodiments, the aerosol generating element comprises from approximately 50 percent by weight to approximately 90 percent by weight of polyhydric alcohol, preferably from approximately 55 percent by weight to approximately 90 percent by weight of polyhydric alcohol, more preferably from approximately 60 percent by weight to approximately 90 percent by weight of polyhydric alcohol, even more preferably from approximately 65 percent by weight to approximately 90 percent by weight of polyhydric alcohol, with the highest preference being from approximately 70 percent by weight to approximately 90 percent by weight of polyhydric alcohol. In additional embodiments, the polyhydric alcohol content in the aerosol-generating formulation ranges from approximately 30 percent to approximately 85 percent by weight based on the total weight of the aerosol-generating element. Preferably, the polyhydric alcohol content in the aerosol-generating formulation ranges from approximately 35 percent to approximately 85 percent by weight based on the total weight of the aerosol-generating element. More preferably, the polyhydric alcohol content in the aerosol-generating formulation ranges from approximately 40 percent to approximately 85 percent by weight based on the total weight of the aerosol-generating element. Even more preferably, the polyhydric alcohol content in the aerosol-generating formulation ranges from approximately 45 percent to approximately 85 percent by weight based on the total weight of the element. Rfrncnn / zznz / E / YiAi aerosol generator. In particularly preferred embodiments, the polyhydric alcohol content in the aerosol generating formulation represents from approximately 50 percent by weight to approximately 85 percent by weight based on the total weight of the aerosol generating element, more preferably from approximately 55 percent by weight to approximately 85 percent by weight based on the total weight of the aerosol generating element, and even more preferably from approximately 60 percent by weight to approximately 85 percent by weight based on the total weight of the aerosol generating element. In the most preferred embodiments, the polyhydric alcohol content in the aerosol generating formulation represents from approximately 65 percent by weight to approximately 85 percent by weight or even from approximately 70 percent by weight to approximately 85 percent by weight based on the total weight of the aerosol generating element. In these embodiments, the aerosol-generating element according to the present invention may comprise from approximately 30% by weight to approximately 85% by weight of a polyhydric alcohol. Preferably, the aerosol-generating element comprises from approximately 35% by weight to approximately 85% by weight of a polyhydric alcohol. More preferably, the aerosol-generating element comprises from approximately 40% by weight to approximately 85% by weight of a polyhydric alcohol. Even more preferably, the aerosol-generating element comprises from approximately 45% by weight to approximately 85% by weight of a polyhydric alcohol.In particularly preferred embodiments, the aerosol generating element comprises from approximately 50 percent by weight to approximately 85 percent by weight of polyhydric alcohol, preferably from approximately 55 percent by weight to approximately 85 percent by weight of polyhydric alcohol, more preferably from approximately 60 percent by weight to approximately 85 percent by weight of polyhydric alcohol, even more preferably of. Rfrncnn / zznz / E / YiAi approximately 65 percent by weight to approximately 85 percent by weight of polyhydric alcohol, with the maximum preference of approximately 70 percent by weight to approximately 85 percent by weight of polyhydric alcohol. In still other embodiments, the polyhydric alcohol content in the aerosol-generating formulation ranges from approximately 30 percent by weight to approximately 80 percent by weight based on the total weight of the aerosol-generating element. Preferably, the polyhydric alcohol content in the aerosol-generating formulation ranges from approximately 35 percent by weight to approximately 80 percent by weight based on the total weight of the aerosol-generating element. More preferably, the polyhydric alcohol content in the aerosol-generating formulation ranges from approximately 40 percent by weight to approximately 80 percent by weight based on the total weight of the aerosol-generating element.Even more preferably, the polyhydric alcohol content in the aerosol-generating formulation represents from approximately 45 percent by weight to approximately 80 percent by weight based on the total weight of the aerosol-generating element. In particularly preferred embodiments, the polyhydric alcohol content in the aerosol-generating formulation represents from approximately 50 percent by weight to approximately 80 percent by weight based on the total weight of the aerosol-generating element, more preferably from approximately 55 percent by weight to approximately 80 percent by weight based on the total weight of the aerosol-generating element, and even more preferably from approximately 60 percent by weight to approximately 80 percent by weight based on the total weight of the aerosol-generating element.In the most preferred embodiments, the polyhydric alcohol content in the aerosol generating formulation represents approximately 65 percent by weight to approximately 80 percent by weight or even approximately 70 percent by weight to approximately 80 percent by weight based on the total weight of the aerosol generating element. Rfrncnn / zznz / E / YiAi aerosol generating dispersed within the solid continuous matrix structure represents at least approximately 84 percent by weight of the total weight of the aerosol generating element. In particularly preferred embodiments, the aerosol-generating formulation dispersed within the solid continuous matrix structure represents at least approximately 86 percent by weight of the total weight of the aerosol-generating element. More preferably, the aerosol-generating formulation dispersed within the solid continuous matrix structure represents at least approximately 88 percent by weight of the total weight of the aerosol-generating element. Even more preferably, the aerosol-generating formulation dispersed within the solid continuous matrix structure represents at least approximately 90 percent by weight of the total weight of the aerosol-generating element. With maximum preference, the aerosol-generating formulation dispersed within the solid continuous matrix structure represents at least approximately 92 percent by weight of the total weight of the aerosol-generating element, or at least approximately 93 percent by weight of the total weight of the aerosol-generating element, or at least approximately 94 percent by weight of the total weight of the aerosol-generating element, or at least approximately 95 percent by weight of the total weight of the aerosol-generating element. In aerosol generating elements where the aerosol-generating formulation represents a fraction of the total weight of the aerosol generating element within the ranges described above, it is advantageously possible to minimize the portion of heat supplied to the aerosol generating element during use that is consumed in raising the temperature of the encapsulation material. As such, a more efficient use of the heat supplied to the aerosol generating element becomes possible, so that the vast majority of this heat is effectively used to release the components of the aerosol formulation from the solid continuous matrix structure and to generate an aerosol. As briefly described above, in an aerosol generating element according to the present invention, the aerosol generating formulation dispersed within the Rfrncnn / zznz / E / YiAi solid continuous matrix structure comprises at least one alkaloid or cannabinoid compound. In some embodiments, the aerosol-generating formulation dispersed within the solid continuous matrix structure comprises both an alkaloid and a cannabinoid compound. As used herein with reference to the invention, the term alkaloid compound is used to describe any of a class of naturally occurring organic compounds containing one or more basic nitrogen atoms. Generally, an alkaloid contains at least one nitrogen atom in an amine-type structure. This or another nitrogen atom in the alkaloid compound molecule may be active as a base in acid-base reactions. Most alkaloid compounds have one or more of their nitrogen atoms as part of a cyclic system, such as a heterocyclic ring. In nature, alkaloid compounds are found primarily in plants and are especially common in certain families of flowering plants. However, some alkaloid compounds are found in animal species and fungi.In the context of the present invention, the term “alkaloid compounds” is used to describe both naturally occurring and synthetically manufactured alkaloid compounds. Alkaloid compounds suitable for use in an aerosol generating element according to the invention include, but are not limited to, nicotine and anatabine. As used herein with reference to the invention, the term cannabinoid compound is used to describe any of a class of naturally occurring compounds found in parts of the cannabis plant, specifically the species Cannabis sativa, Cannabis indica, and Cannabis ruderalis. Cannabinoid compounds are especially concentrated in the flower heads of the female plants. Cannabinoid compounds naturally present in the cannabis plant include tetrahydrocannabinol (THC) and cannabidiol (CBD). In the context of the present invention, the The term “cannabinoid compounds” is used to describe both naturally occurring cannabinoid compounds and synthetically manufactured cannabinoid compounds. Cannabinoid compounds suitable for use in an aerosol generating element according to the invention include tetrahydrocannabinol (THC), tetrahydrocannabinolic acid (THCA), cannabidiol (CBD), cannabidiolic acid (CBDA), cannabinol (CBN), cannabigerol (CBG), cannabigerol monomethyl ether (CBGM), cannabivarin (CBV), cannabidivarin (CBDV), tetrahydrocannabivarin (THCV), cannabichromene (CBC), cannabicyclo (CBL), cannabichromevarin (CBCV), cannabigerovarin (CBGV), cannabielsoin (CBE), and cannabicitran (CBT). In general, the aerosol-generating element may comprise up to approximately 10 percent by weight of an alkaloid compound or a cannabinoid compound, or both. Given the applications of the aerosol-generating element of the invention as a substrate in an aerosol-generating article, this is advantageous because the content of the alkaloid compound or cannabinoid compound, or both, in the element can be increased and adjusted to optimize the delivery of the alkaloid compound or cannabinoid compound, or both, in aerosol form to a consumer. Compared to existing aerosol-generating substrates based on the use of plant material, this can advantageously allow for higher contents of the alkaloid compound or cannabinoid compound, or both, per volume of substrate (element or elements) or per weight of substrate (element or elements), which may be convenient from a manufacturing standpoint. Preferably, the content of at least one alkaloid or cannabinoid compound in the aerosol-generating formulation dispersed within the solid continuous matrix structure represents at least 0.5 percent by weight of the total weight of the aerosol-generating element. Therefore, the aerosol-generating element preferably comprises at least approximately 0.5 percent by weight of an alkaloid compound or at least 0.5 percent Rfrncnn / zznz / E / YiAi by weight of a cannabinoid compound or at least approximately 0.5 percent by weight of a combination of an alkaloid compound and a cannabinoid compound. More preferably, the aerosol-generating element comprises at least approximately 1 percent by weight of an alkaloid compound or a cannabinoid compound, or both. Even more preferably, the aerosol-generating element comprises at least approximately 2 percent by weight of an alkaloid compound or a cannabinoid compound, or both. The aerosol-generating element preferably comprises less than approximately 8 percent by weight of an alkaloid compound or a cannabinoid compound, or both. More preferably, the aerosol-generating element comprises less than approximately 6 percent by weight of an alkaloid compound or a cannabinoid compound, or both. Even more preferably, the aerosol-generating element comprises less than approximately 5 percent by weight of an alkaloid compound or a cannabinoid compound, or both. Most preferably, the aerosol-generating element comprises less than approximately 4 percent by weight of an alkaloid compound or a cannabinoid compound, or both. In some embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 10 percent by weight of an alkaloid compound or a cannabinoid compound or both, more preferably from approximately 1 percent by weight to approximately 10 percent by weight of an alkaloid compound or a cannabinoid compound or both, even more preferably from approximately 2 percent by weight to approximately 10 percent by weight of an alkaloid compound or a cannabinoid compound or both. In other embodiments, the aerosol-generating element comprises from approximately 0.5 percent by weight to approximately 8 percent by weight of an alkaloid compound or a cannabinoid compound or both, more preferably approximately 1 percent in Rfrncnn / zznz / E / YiAi weight to approximately 8 percent by weight of an alkaloid compound or a cannabinoid compound or both, even more preferably from approximately 2 percent by weight to approximately 8 percent by weight of an alkaloid compound or a cannabinoid compound or both. In additional embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 6 percent by weight of an alkaloid compound or a cannabinoid compound or both, more preferably from approximately 1 percent by weight to approximately 6 percent by weight of an alkaloid compound or a cannabinoid compound or both, even more preferably from approximately 2 percent by weight to approximately 6 percent by weight of an alkaloid compound or a cannabinoid compound or both. In still other embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 5 percent by weight of an alkaloid compound or a cannabinoid compound or both, more preferably from approximately 1 percent by weight to approximately 5 percent by weight of an alkaloid compound or a cannabinoid compound or both, even more preferably from approximately 2 percent by weight to approximately 5 percent by weight of an alkaloid compound or a cannabinoid compound or both. In particularly preferred embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 4 percent by weight of an alkaloid compound or a cannabinoid compound or both, more preferably from approximately 1 percent by weight to approximately 4 percent by weight of an alkaloid compound or a cannabinoid compound or both, even more preferably from approximately 2 percent by weight to approximately 4 percent by weight of an alkaloid compound or a cannabinoid compound or both. Rfrncnn / zznz / E / YiAi In some embodiments, the aerosol-generating element comprises one or more cannabinoid and alkaloid compounds comprising nicotine or anatabine. In some preferred embodiments, the aerosol-generating element comprises nicotine. As used herein with reference to the invention, the term “nicotine” is used to describe nicotine, a nicotine base, or a nicotine salt. In embodiments where the aerosol generating element comprises a nicotine base or a nicotine salt, the amounts of nicotine listed herein are the amount of freebase nicotine or the amount of protonated nicotine, respectively. The aerosol generating element may comprise natural nicotine or synthetic nicotine. The aerosol generating element may comprise one or more monoprotic nicotine salts. As used in the present description, with reference to the invention, the term “monoprotic nicotine salt” is used to describe a nicotine salt of a monoprotic acid. In general, the aerosol-generating element can comprise up to approximately 10 percent nicotine by weight. Given the applications of the aerosol-generating element of the invention as a substrate in an aerosol-generating article, this is advantageous because the nicotine content in the element can be increased and adjusted to optimize the delivery of aerosolized nicotine to a consumer. Compared to existing aerosol-generating substrates based on the use of the tobacco plant, this can advantageously allow for higher nicotine contents per volume of substrate (element or elements) or per weight of substrate (element or elements), which may be desirable from a manufacturing standpoint. Preferably, the aerosol generating element comprises at least approximately 0.5 percent by weight of nicotine. More preferably, the aerosol generating element comprises at least approximately 1 percent by weight of nicotine. Rfrncnn / zznz / E / YiAi Even more preferably, the aerosol generating element comprises at least approximately 2 percent by weight of nicotine. The aerosol-generating element preferably comprises less than or equal to approximately 8 percent by weight of nicotine. More preferably, the aerosol-generating element comprises less than or equal to approximately 6 percent by weight of nicotine. Even more preferably, the aerosol-generating element comprises less than or equal to approximately 5 percent by weight of nicotine. Most preferably, the aerosol-generating element comprises less than or equal to approximately 4 percent by weight of nicotine. In some embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 10 percent by weight of nicotine, more preferably from approximately 1 percent by weight to approximately 10 percent by weight of nicotine, even more preferably from approximately 2 percent by weight to approximately 10 percent by weight of nicotine. In other embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 8 percent by weight of nicotine, more preferably from approximately 1 percent by weight to approximately 8 percent by weight of nicotine, even more preferably from approximately 2 percent by weight of nicotine to approximately 8 percent by weight of nicotine. In additional embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 6 percent by weight of nicotine, more preferably from approximately 1 percent by weight to approximately 6 percent by weight of nicotine, even more preferably from approximately 2 percent by weight to approximately 6 percent by weight of nicotine. In still other forms, the aerosol-generating element comprises from approximately 0.5 percent by weight to approximately 5 percent by weight of nicotine, Rfrncnn / zznz / E / YiAi more preferably from about 1 percent by weight to about 5 percent by weight of nicotine, even more preferably from about 2 percent by weight to about 5 percent by weight of nicotine. In particularly preferred embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 4 percent by weight of nicotine, more preferably from approximately 1 percent by weight to approximately 4 percent by weight of nicotine, even more preferably from approximately 2 percent by weight to approximately 4 percent by weight of nicotine. Preferably, the aerosol-generating element comprises at least approximately 0.5 milligrams of nicotine. More preferably, the aerosol-generating element comprises at least approximately 1 milligram of nicotine. Even more preferably, the aerosol-generating element comprises at least approximately 1.5 milligrams of nicotine. In particularly preferred embodiments, the aerosol-generating element comprises at least approximately 2 milligrams of nicotine, and most preferably at least approximately 2.5 milligrams of nicotine. The aerosol-generating element may comprise up to approximately 6 milligrams of nicotine. Preferably, the aerosol-generating element comprises less than or equal to approximately 5 milligrams of nicotine. More preferably, the aerosol-generating element comprises less than or equal to approximately 4.5 milligrams of nicotine. Even more preferably, the aerosol-generating element comprises less than or equal to approximately 4 milligrams of nicotine. In particularly preferred embodiments, the aerosol-generating element comprises less than or equal to approximately 3.5 milligrams of nicotine, and most preferably less than or equal to approximately 3 milligrams of nicotine. In some preferred embodiments, the aerosol-generating formulation dispersed within the solid continuous matrix structure of the aerosol-generating element comprises Rfrncnn / zznz / E / YiAi is a cannabinoid compound. Preferably, the cannabinoid compound is selected from CBD and THC. More preferably, the cannabinoid compound is CBD. The aerosol-generating element may comprise up to approximately 10 percent by weight of CBD. Preferably, the aerosol-generating element comprises at least approximately 0.5 percent by weight of CBD. More preferably, the aerosol-generating element comprises at least approximately 1 percent by weight of CBD. Even more preferably, the aerosol-generating element comprises at least approximately 2 percent by weight of CBD. The aerosol-generating element preferably comprises less than or equal to approximately 6 percent by weight of CBD. More preferably, the aerosol-generating element comprises less than or equal to approximately 5 percent by weight of CBD. Even more preferably, the aerosol-generating element comprises less than or equal to approximately 4 percent by weight of CBD. In some embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 10 percent by weight of CBD, more preferably from approximately 1 percent by weight to approximately 10 percent by weight of CBD, even more preferably from approximately 2 percent by weight to approximately 10 percent by weight of CBD. In other embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 8 percent by weight of CBD, more preferably from approximately 1 percent by weight to approximately 8 percent by weight of CBD, even more preferably from approximately 2 percent by weight to approximately 8 percent by weight of CBD. In additional embodiments, the aerosol-generating element comprises from approximately 0.5 percent by weight to approximately 6 percent by weight of CBD, more preferably from approximately 1 percent by weight to approximately 6 percent in Rfrncnn / zznz / E / YiAi CBD weight, even more preferably from approximately 2 percent by weight to approximately 6 percent by weight of CBD. In still other embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 5 percent by weight of CBD, more preferably from approximately 1 percent by weight to approximately 5 percent by weight of CBD, even more preferably from approximately 2 percent by weight to approximately 5 percent by weight of CBD. In particularly preferred embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 4 percent by weight of CBD, more preferably from approximately 1 percent by weight to approximately 4 percent by weight of CBD, even more preferably from approximately 2 percent by weight to approximately 4 percent by weight of nicotine. An aerosol generating element according to the present invention may be an essentially tobacco-free aerosol generating element. As used herein with reference to the invention, the term essentially tobacco-free aerosol generating element describes an aerosol generating element having a tobacco content of less than 1 percent by weight. For example, the aerosol generating element may have a tobacco content of less than approximately 0.75 percent by weight, less than approximately 0.5 percent by weight, or less than approximately 0.25 percent by weight. The aerosol generating element can be a tobacco-free aerosol generating element. As used herein with reference to the invention, the term tobacco-free aerosol generating element describes an aerosol generating element having a tobacco content of 0 percent by weight. In some embodiments, the aerosol-generating element comprises tobacco material or a non-tobacco plant material or plant extract. For example, the element Rfrncnn / zznz / E / YiAi aerosol generator may comprise tobacco particles, such as tobacco leaf particles, as well as particles of other botanicals, such as clove and eucalyptus. In some embodiments, the aerosol-generating formulation dispersed within the continuous solid matrix structure further comprises an acid. More preferably, the aerosol-generating formulation dispersed within the continuous solid matrix structure comprises one or more organic acids. Even more preferably, the aerosol-generating formulation dispersed within the continuous solid matrix structure comprises one or more carboxylic acids. The carboxylic acids suitable for use in the aerosol-generating formulation of aerosol-generating elements according to the present invention include, but are not limited to: 2-ethylbutyric acid, acetic acid, adipic acid, benzoic acid, butyric acid, cinnamic acid, cycloheptanecarboxylic acid, fumaric acid, glycolic acid, hexanoic acid, lactic acid, levulinic acid, melic acid, myristic acid, octanoic acid, oxalic acid, propanoic acid, pyruvic acid, succinic acid, and undecanoic acid. In particularly preferred embodiments, the acid is lactic acid, levulinic acid, benzoic acid, fumaric acid, or acetic acid. Most preferably, the acid is lactic acid. The inclusion of an acid is particularly preferred in aerosol-generating element (AGU) configurations where the aerosol-generating formulation dispersed within the continuous solid matrix structure comprises nicotine. This is because the presence of an acid has been observed to stabilize dissolved species in the aerosol-generating formulation, such as nicotine and other plant extracts. Without intending to impose any theory, it is understood that the acid can interact with the nicotine molecule, thereby stabilizing the protonated nicotine. Since protonated nicotine is non-volatile, it is more readily found in the liquid or particulate phase rather than in the vapor phase of an aerosol obtained by heating the AGU. As such, the Rfrncnn / zznz / E / γΐΛΐ nicotine loss during the manufacture of the aerosol generating element, and a larger and better controlled nicotine supply to the consumer can be advantageously ensured. The aerosol generating element may comprise up to approximately 10 percent by weight of an acid. Preferably, the aerosol generating element comprises at least approximately 0.5 percent by weight of an acid. More preferably, the aerosol generating element comprises at least approximately 1 percent by weight of an acid. Even more preferably, the aerosol generating element comprises at least approximately 2 percent by weight of an acid. The aerosol-generating element preferably comprises less than or equal to approximately 8 percent by weight of an acid. More preferably, the aerosol-generating element comprises less than or equal to approximately 6 percent by weight of an acid. Even more preferably, the aerosol-generating element comprises less than or equal to approximately 5 percent by weight of an acid. Most preferably, the aerosol-generating element comprises less than or equal to approximately 4 percent by weight of an acid. In some embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 10 percent by weight of an acid, more preferably from approximately 1 percent by weight to approximately 10 percent by weight of an acid, even more preferably from approximately 2 percent by weight to approximately 10 percent by weight of an acid. In other embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 8 percent by weight of an acid, more preferably from approximately 1 percent by weight to approximately 8 percent by weight of an acid, even more preferably from approximately 2 percent by weight to approximately 8 percent by weight of an acid. Rfrncnn / zznz / E / YiAi In additional embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 6 percent by weight of an acid, more preferably from approximately 1 percent by weight to approximately 6 percent by weight of an acid, even more preferably from approximately 2 percent by weight to approximately 6 percent by weight of an acid. In still other embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 5 percent by weight of an acid, more preferably from approximately 1 percent by weight to approximately 5 percent by weight of an acid, even more preferably from approximately 2 percent by weight to approximately 5 percent by weight of an acid. In particularly preferred embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 4 percent by weight of an acid, more preferably from approximately 1 percent by weight to approximately 4 percent by weight of an acid, even more preferably from approximately 2 percent by weight to approximately 4 percent by weight of an acid. Preferably, when the aerosol generating solution comprises nicotine, the molar ratio of acid to nicotine is between approximately 0.5:1 and approximately 2:1, more preferably between approximately 0.75:1 and approximately 1.5:1, with the highest preference being approximately 1:1. When using a multivalent acid, such as a multivalent carboxylic acid, it may be preferable to provide a molar ratio of the acid groups to nicotine of between approximately 0.5:1 and approximately 2:1, more preferably between approximately 0.75:1 and approximately 1.5:1, with the highest preference being approximately 1:1. Thus, the use of a multivalent acid allows a lower weight of the acid to be used while providing the same level of nicotine protonation. Rfrncnn / zznz / E / YiAi In preferred embodiments, the aerosol-generating element comprises at least approximately 0.5 percent by weight of levulinic acid. More preferably, the aerosol-generating element comprises at least approximately 1 percent by weight of levulinic acid. Even more preferably, the aerosol-generating element comprises at least approximately 2 percent by weight of levulinic acid. The aerosol-generating element preferably comprises less than or equal to approximately 8 percent by weight of levulinic acid. More preferably, the aerosol-generating element comprises less than or equal to approximately 6 percent by weight of levulinic acid. Even more preferably, the aerosol-generating element comprises less than or equal to approximately 5 percent by weight of levulinic acid. Most preferably, the aerosol-generating element comprises less than or equal to approximately 4 percent by weight of levulinic acid. In some embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 10 percent by weight of levulinic acid, more preferably from approximately 1 percent by weight to approximately 10 percent by weight of levulinic acid, even more preferably from approximately 2 percent by weight to approximately 10 percent by weight of levulinic acid. In other embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 8 percent by weight of levulinic acid, more preferably from approximately 1 percent by weight to approximately 8 percent by weight of levulinic acid, even more preferably from approximately 2 percent by weight to approximately 8 percent by weight of levulinic acid. In additional embodiments, the aerosol-generating element comprises from approximately 0.5 percent by weight to approximately 6 percent by weight of levulinic acid, more preferably from approximately 1 percent by weight to approximately Rfrncnn / zznz / E / YiAi percent by weight of levulinic acid, even more preferably from about 2 percent by weight to about 6 percent by weight of levulinic acid. In still other embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 5 percent by weight of levulinic acid, more preferably from approximately 1 percent by weight to approximately 5 percent by weight of levulinic acid, even more preferably from approximately 2 percent by weight to approximately 5 percent by weight of levulinic acid. In particularly preferred embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 4 percent by weight of levulinic acid, more preferably from approximately 1 percent by weight to approximately 4 percent by weight of levulinic acid, even more preferably from approximately 2 percent by weight to approximately 4 percent by weight of levulinic acid. In other preferred embodiments, the aerosol-generating element comprises at least approximately 0.5 percent by weight of lactic acid. More preferably, the aerosol-generating element comprises at least approximately 1 percent by weight of lactic acid. Even more preferably, the aerosol-generating element comprises at least approximately 2 percent by weight of lactic acid. The aerosol-generating element preferably comprises less than or equal to approximately 8 percent by weight of lactic acid. More preferably, the aerosol-generating element comprises less than or equal to approximately 6 percent by weight of lactic acid. Even more preferably, the aerosol-generating element comprises less than or equal to approximately 5 percent by weight of lactic acid. Most preferably, the aerosol-generating element comprises less than or equal to approximately 4 percent by weight of lactic acid. In some embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 10 percent by weight of acid Rfrncnn / zznz / E / YiAi lactic, more preferably from about 1 percent by weight to about 10 percent by weight of lactic acid, even more preferably from about 2 percent by weight to about 10 percent by weight of lactic acid. In other embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 8 percent by weight of lactic acid, more preferably from approximately 1 percent by weight to approximately 8 percent by weight of lactic acid, even more preferably from approximately 2 percent by weight to approximately 8 percent by weight of lactic acid. In additional embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 6 percent by weight of lactic acid, more preferably from approximately 1 percent by weight to approximately 6 percent by weight of lactic acid, even more preferably from approximately 2 percent by weight to approximately 6 percent by weight of lactic acid. In still other embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 5 percent by weight of lactic acid, more preferably from approximately 1 percent by weight to approximately 5 percent by weight of lactic acid, even more preferably from approximately 2 percent by weight to approximately 5 percent by weight of lactic acid. In particularly preferred embodiments, the aerosol generating element comprises from approximately 0.5 percent by weight to approximately 4 percent by weight of lactic acid, more preferably from approximately 1 percent by weight to approximately 4 percent by weight of lactic acid, even more preferably from approximately 2 percent by weight to approximately 4 percent by weight of lactic acid. An aerosol generating element according to the present invention preferably comprises less than or equal to approximately 25 percent by weight of water. Rfrncnn / zznz / E / YiAi More preferably, the aerosol generating element comprises less than or equal to approximately 20 percent by weight of water. Even more preferably, the aerosol generating element comprises less than or equal to approximately 15 percent of water. An aerosol generating element according to the present invention preferably comprises at least approximately 2.5 percent by weight of water. More preferably, the aerosol generating element according to the present invention preferably comprises at least approximately 5 percent by weight of water. Even more preferably, the aerosol generating element according to the present invention preferably comprises at least approximately 7.5 percent by weight of water. Most preferably, the aerosol generating element according to the present invention preferably comprises at least approximately 10 percent by weight of water. In general, the presence of some water has been observed to contribute to the aerosol-generating element's stability. At the same time, a residual water content of 25 percent by weight or less is desirable, as it yields an essentially non-sticky aerosol-generating element. Furthermore, heating an aerosol-generating element with a lower water content can provide the consumer with an aerosol more concentrated in the polyhydric alcohol and the alkaloid or cannabinoid compound, such as nicotine. In some embodiments, the aerosol generating element according to the present invention comprises from approximately 2.5 percent by weight to approximately 25 percent by weight of water. Preferably, the aerosol generating element according to the present invention comprises from 5 percent by weight to 25 percent by weight of water. More preferably, the aerosol generating element according to the present invention comprises from approximately 7.5 percent by weight to approximately 25 percent by weight of water. In the highest preference, the aerosol generating element of Rfrncnn / zznz / E / YiAi in accordance with the present invention comprises from approximately 10 percent by weight to approximately 25 percent by weight of water. In other embodiments, the aerosol generating element according to the present invention comprises from approximately 2.5 percent by weight to approximately 20 percent by weight of water. Preferably, the aerosol generating element according to the present invention comprises from 5 percent by weight to 20 percent by weight of water. More preferably, the aerosol generating element according to the present invention comprises from approximately 7.5 percent by weight to approximately 20 percent by weight of water. Most preferably, the aerosol generating element according to the present invention comprises from approximately 10 percent by weight to approximately 20 percent by weight of water. In further embodiments, the aerosol generating element according to the present invention comprises from approximately 2.5 percent by weight to approximately 15 percent by weight of water. Preferably, the aerosol generating element according to the present invention comprises from 5 percent by weight to 15 percent by weight of water. More preferably, the aerosol generating element according to the present invention comprises from approximately 7.5 percent by weight to approximately 15 percent by weight of water. Most preferably, the aerosol generating element according to the present invention comprises from approximately 10 percent by weight to approximately 15 percent by weight of water. In still other embodiments, the aerosol generating element according to the present invention comprises from approximately 2.5 percent by weight to approximately 10 percent by weight of water. Preferably, the aerosol generating element according to the present invention comprises from 5 percent by weight to 10 percent by weight of water. More preferably, the aerosol generating element according to the present invention comprises from approximately 7.5 percent by weight to Rfrncnn / zznz / E / YiAi approximately 10 percent by weight of water. With the highest preference, the aerosol generating element according to the present invention comprises from approximately 10 percent by weight to approximately 10 percent by weight of water. An aerosol generating element according to the present invention preferably has a water activity less than or equal to approximately 0.7. The term water activity is used herein with reference to the present invention to indicate the ratio of the partial water vapor pressure in equilibrium with an aerosol generating element to the saturation water vapor pressure in equilibrium with pure water at the same temperature. As such, water activity is a dimensionless quantity between 0, corresponding to a completely anhydrous substance, and 1, corresponding to pure salt-free water. Methods for measuring the water activity of an aerosol generating element according to the present invention are described in the 2017 publication of ISO 18787 (Foodstuffs - Determination of water activity - dew point measurement). An aerosol generating element according to the present invention may optionally further comprise a flavoring. The flavoring may be in liquid or solid form. Optionally, the flavoring may be provided in a microencapsulated form where the flavoring is released upon heating. Preferably, the aerosol generating element comprises at least approximately 0.05 percent by weight of flavoring, more preferably at least approximately 0.1 percent by weight of flavoring based on the total weight of the aerosol generating element. The aerosol generating element preferably comprises less than or equal to approximately 1 percent by weight of flavoring, more preferably less than or equal to approximately 0.5 percent by weight of flavoring based on the total weight of the aerosol generating element. Rfrncnn / zznz / E / YiAi In some embodiments, the aerosol generating element comprises from approximately 0.05 percent by weight to approximately 1 percent by weight of flavoring, preferably from approximately 0.05 percent by weight to approximately 0.5 percent by weight of flavoring based on the total weight of the aerosol generating element. In other embodiments, the aerosol generating element comprises from approximately 0.1 percent by weight to approximately 1 percent by weight of flavoring, preferably from approximately 0.1 percent by weight to approximately 0.5 percent by weight of flavoring based on the total weight of the aerosol generating element. Flavorings suitable for use in an aerosol generating element according to the present invention include, among others: tobacco, menthol, mint, such as peppermint or spearmint, cocoa, licorice, fruits (such as citrus), gamma octalactone, vanillin, spices (such as cinnamon), methyl salicylate, linalool, eugenol, eucalyptol, bergamot oil, eugenol oil, geranium oil, lemon oil, ginger oil, and tobacco flavor. An aerosol generating element according to the present invention may optionally further comprise a plurality of susceptor particles. Susceptor particles are conductive particles capable of converting electromagnetic energy into heat. When exposed to an alternating electromagnetic field, eddy currents and hysteresis losses are induced in the susceptor particles, causing them to heat up. Since the susceptor particles are in thermal contact or close thermal proximity to the aerosol generating formulation of the aerosol generating element, the aerosol generating formulation is heated by the susceptor particles, resulting in the formation of an aerosol. The inclusion of susceptor particles in the aerosol-generating solution thus provides an aerosol-generating element that can be inductively heated. When the aerosol-generating element is used in a device comprising an induction heater, changing the electromagnetic fields generated by one or more coils of Rfrncnn / zznz / E / YiAi Induction of an inductive heating device heats the susceptor particles, which then transfer the heat to the surrounding aerosol generating formulation of the aerosol generating element, mainly by heat conduction. The susceptor particles may be formed from any material that can be induction-heated to a temperature sufficient to generate an aerosol from the aerosol-generating formulation. Preferred susceptor particles comprise a metal or carbon. Preferred susceptor particles may comprise or consist of a ferromagnetic material, for example, a ferromagnetic alloy, ferritic iron, ferromagnetic steel, or stainless steel. Suitable susceptor particles may be, or comprise, aluminum. Preferred susceptor particles may be heated to a temperature above 250 degrees Celsius. Suitable susceptor particles may comprise a non-metallic core with a metallic layer disposed on the non-metallic core, for example, metallic tracks formed on the surface of a ceramic core.Susceptor particles may have an outer protective layer, for example, a ceramic or glass protective layer that encapsulates the susceptor particle. Susceptor particles may comprise a protective coating made of glass, ceramic, or an inert metal, formed on a core of susceptor material. The susceptor particles can have an average particle size of up to approximately 60 micrometers. For example, the susceptor particles can have an average particle size less than or equal to approximately 50 micrometers, or less than or equal to approximately 40 micrometers, or less than or equal to approximately 35 micrometers. Typically, in an aerosol generating solution for use in methods according to the present invention, the susceptor particles have an average particle size of at least approximately 1 micrometer, or at least approximately 2 micrometers, or at least approximately 5 micrometers, or at least approximately 10 micrometers. Rfrncnn / zznz / E / YiAi For example, the susceptor particles in the aerosol-generating solution may have an average particle size of approximately 1 micrometer to approximately 60 micrometers, or from approximately 2 millimeters to approximately 50 micrometers, or from approximately 5 micrometers to approximately 40 micrometers, or from approximately 10 micrometers to approximately 35 micrometers. Optionally, the aerosol-generating formulation dispersed within the solid continuous matrix structure of the aerosol-generating elements according to the present invention may further comprise a solid filler. The inclusion of a solid filler may advantageously improve the physical properties of the aerosol-generating element. Without intending to impose any theory, it is understood that, during the manufacture of the aerosol-generating element, the inclusion of a solid filler may facilitate the control of the properties of the aerosol-generating solution during the stage of forming a discrete portion of the aerosol-generating solution. Suitable solid fillers will be known to those skilled in the art. For example, an aerosol generating element according to the present invention may optionally further comprise particles of plant material obtained by pulverizing, crushing, or grinding plant material. By way of example, the aerosol generating element may further comprise particles of tea, coffee, cannabis, clove, eucalyptus, star anise, or ginger. Alternatively or additionally, an aerosol generating element according to the present invention may optionally further comprise particles obtained by pulverizing, crushing, or grinding one or more sheets of tobacco leaves and tobacco leaf stems. The inventors of the present invention have discovered that by incorporating such plant particles into the aerosol generating element, it is advantageously possible to produce an aerosol that provides a novel sensory experience. Rfrncnn / zznz / E / YiAi Such spray provides unique flavors and can provide an increased level of mouth fullness sensation. In embodiments where the aerosol-generating element comprises plant particles, the amount of plant particles in the aerosol-generating solution is adjusted to provide the desired level of plant particles within the aerosol-generating element and the desired level of flavor within the generated aerosol. The aerosol-generating element may comprise up to approximately 40 percent by weight of plant particles. Preferably, the aerosol-generating element comprises less than or equal to approximately 35 percent by weight of plant particles. More preferably, the aerosol-generating element comprises less than or equal to approximately 30 percent by weight of plant particles. Even more preferably, the aerosol-generating element comprises less than or equal to approximately 25 percent by weight of plant particles. In some embodiments, the aerosol-generating element comprises at least approximately 1 percent by weight of plant particles. Preferably, the aerosol-generating element comprises at least approximately 2 percent by weight of plant particles. More preferably, the aerosol-generating element comprises at least approximately 5 percent by weight of plant particles. Even more preferably, the aerosol-generating element comprises at least approximately 10 percent by weight of plant particles. In some preferred embodiments, the aerosol-generating element comprises from approximately 1 percent by weight to approximately 40 percent by weight of plant particles. Preferably, the aerosol-generating element comprises from approximately 2 percent by weight to approximately 40 percent by weight of plant particles. More preferably, the aerosol-generating element comprises from approximately 5 percent by weight to approximately 40 percent by weight of plant particles. Even more preferably, the aerosol-generating element comprises Rfrncnn / zznz / E / YiAi from approximately 10 percent by weight to approximately 40 percent by weight of plant particles. In other embodiments, the aerosol-generating element comprises from approximately 1 percent by weight to approximately 35 percent by weight of plant particles. Preferably, the aerosol-generating element comprises from approximately 2 percent by weight to approximately 35 percent by weight of plant particles. More preferably, the aerosol-generating element comprises from approximately 5 percent by weight to approximately 35 percent by weight of plant particles. Even more preferably, the aerosol-generating element comprises from approximately 10 percent by weight to approximately 35 percent by weight of plant particles. In additional embodiments, the aerosol-generating element comprises from approximately 1 percent to approximately 30 percent by weight of plant particles. Preferably, the aerosol-generating element comprises from approximately 2 percent to approximately 30 percent by weight of plant particles. More preferably, the aerosol-generating element comprises from approximately 5 percent to approximately 30 percent by weight of plant particles. Even more preferably, the aerosol-generating element comprises from approximately 10 percent to approximately 30 percent by weight of plant particles. In still other embodiments, the aerosol-generating element comprises from approximately 1 percent by weight to approximately 25 percent by weight of plant particles. Preferably, the aerosol-generating element comprises from approximately 2 percent by weight to approximately 25 percent by weight of plant particles. More preferably, the aerosol-generating element comprises from approximately 5 percent by weight to approximately 25 percent by weight of plant particles. Even more preferably, the aerosol-generating element comprises Rfrncnn / zznz / E / YiAi approximately 10 percent by weight to approximately 25 percent by weight of plant particles. Providing a quantity of plant particles within this range ensures that sufficient flavor can be achieved from the plant particles without so much affecting the consistency of the aerosol generating solution that the processing of the aerosol generating solution to form the aerosol generating element is negatively affected. In embodiments where the aerosol generating element comprises plant particles, the plant particles can have an average particle size of up to approximately 60 micrometers. Preferably, in an aerosol generating element according to the present invention, the plant particles have an average particle size of approximately 50 micrometers or less. More preferably, in an aerosol generating element according to the present invention, the plant particles have an average particle size of approximately 40 micrometers or less. Even more preferably, in an aerosol generating element according to the present invention, the plant particles have an average particle size of approximately 30 micrometers or less. Typically, in an aerosol generating element according to the present invention, the plant particles have an average particle size of at least approximately 1 micrometer. Preferably, in an aerosol generating element according to the present invention, the plant particles have an average particle size of at least approximately 2 micrometers. More preferably, in an aerosol generating element according to the present invention, the plant particles have an average particle size of at least approximately 5 micrometers. Even more preferably, in an aerosol generating element according to the present invention, the plant particles have an average particle size of at least approximately 10 micrometers. Rfrncnn / zznz / E / YiAi In some preferred embodiments, in an aerosol generating element according to the present invention, the plant particles have an average particle size of approximately 1 millimeter to approximately 60 micrometers. Preferably, in an aerosol generating element according to the present invention, the plant particles have an average particle size of approximately 2 millimeters to approximately 60 micrometers. More preferably, in an aerosol generating element according to the present invention, the plant particles have an average particle size of approximately 5 millimeters to approximately 60 micrometers. Even more preferably, in an aerosol generating element according to the present invention, the plant particles have an average particle size of approximately 10 millimeters to approximately 60 micrometers. In other embodiments of an aerosol generating element according to the present invention, the plant particles have an average particle size of approximately 1 millimeter to approximately 50 micrometers. Preferably, in an aerosol generating element according to the present invention, the plant particles have an average particle size of approximately 2 millimeters to approximately 50 micrometers. More preferably, in an aerosol generating element according to the present invention, the plant particles have an average particle size of approximately 5 millimeters to approximately 50 micrometers. Even more preferably, in an aerosol generating element according to the present invention, the plant particles have an average particle size of approximately 10 millimeters to approximately 50 micrometers. In further embodiments, in an aerosol generating element according to the present invention, the plant particles have an average particle size of approximately 1 millimeter to approximately 40 micrometers. Preferably, in an aerosol generating element according to the present invention, the plant particles Rfrncnn / zznz / E / YiAi have an average particle size of approximately 2 millimeters to approximately 40 micrometers. More preferably, in an aerosol generating element according to the present invention, the plant particles have an average particle size of approximately 5 millimeters to approximately 40 micrometers. Even more preferably, in an aerosol generating element according to the present invention, the plant particles have an average particle size of approximately 10 millimeters to approximately 40 micrometers. In still other embodiments, in an aerosol generating element according to the present invention, the plant particles have an average particle size of approximately 1 millimeter to approximately 30 micrometers. Preferably, in an aerosol generating element according to the present invention, the plant particles have an average particle size of approximately 2 millimeters to approximately 30 micrometers. More preferably, in an aerosol generating element according to the present invention, the plant particles have an average particle size of approximately 5 millimeters to approximately 30 micrometers. Even more preferably, in an aerosol generating element according to the present invention, the plant particles have an average particle size of approximately 10 millimeters to approximately 30 micrometers.An aerosol generating element according to the invention may have an equivalent diameter of at least approximately 0.5 millimeters. The term “equivalent diameter of an aerosol generating element” is used herein to denote the diameter of the sphere that has the same volume as the aerosol generating element. In general, the aerosol generating element may have any shape, although a spherical or quasi-spherical shape, such as an egg or ellipsoid, is preferred. For an aerosol generating element that has a spherical shape and a circular cross-section, the equivalent diameter is the diameter of the cross-section of the aerosol generating element. Rfrncnn / zznz / E / YiAi Preferably, the aerosol generating element has an equivalent diameter of at least approximately 1 millimeter. More preferably, the aerosol generating element has an equivalent diameter of at least approximately 2 millimeters. Even more preferably, the aerosol generating element has an equivalent diameter of at least approximately 3 millimeters. An aerosol generating element according to the invention preferably has an equivalent diameter of less than or equal to approximately 8 millimeters. More preferably, the aerosol generating element has an equivalent diameter of less than or equal to approximately 6 millimeters. Even more preferably, the aerosol generating element has an equivalent diameter of less than or equal to approximately 5 millimeters. In some embodiments, the aerosol generating element has an equivalent diameter of approximately 0.5 millimeters to approximately 8 millimeters, preferably from approximately 1 millimeter to approximately 8 millimeters, more preferably from approximately 2 millimeters to approximately 8 millimeters, and even more preferably from approximately 3 millimeters to approximately 8 millimeters. In other embodiments, the aerosol generating element has an equivalent diameter of approximately 0.5 millimeters to approximately 6 millimeters, preferably from approximately 1 millimeter to approximately 6 millimeters, more preferably from approximately 2 millimeters to approximately 6 millimeters, and even more preferably from approximately 3 millimeters to approximately 6 millimeters. In additional embodiments, the aerosol generating element has an equivalent diameter of approximately 0.5 millimeters to approximately 5 millimeters, preferably from approximately 1 millimeter to approximately 5 millimeters, more preferably from approximately 2 millimeters to approximately 5 millimeters, and even more preferably from approximately 3 millimeters to approximately 5 millimeters. Rfrncnn / zznz / E / YiAi In particularly preferred embodiments, the aerosol generating element has an equivalent diameter of approximately 4 millimeters or approximately 4.5 millimeters. The aerosol generating elements according to the present invention can have an ovality of up to approximately 35 percent. The term “ovality” as used herein with reference to the present invention denotes the degree of deviation from a perfect circle. Ovality is expressed as a percentage, and the mathematical definition is given below. Circular shape a = b Rfrncnn / zznz / E / YiAi Oval shape a / b , 2(a — b) ovality (%) = ----:— x 100% a + b To determine the ovality of an object, such as an aerosol-generating element, the object can be viewed along a direction essentially perpendicular to a cross-section of the aerosol-generating element. For example, the aerosol-generating element can be placed on a transparent stage so that an image of the aerosol-generating element is recorded by a suitable imaging device located below the stage. Dimension “a” is considered the largest external diameter of the image of the aerosol-generating element, and dimension “b” is considered the smallest external diameter of the image of the aerosol-generating element. The process is repeated for a total of ten aerosol-generating elements that have the same composition and are prepared by the same process and under the same operating conditions.The numerical average of the ten ovality measurements is recorded as the ovality for that aerosol-generating element. Preferably, an aerosol generating element according to the invention has an ovality less than or equal to approximately 30 percent. More preferably, an aerosol generating element according to the invention has an ovality less than or equal to approximately 25 percent. Even more preferably, an aerosol generating element according to the invention has an ovality less than or equal to approximately 20 percent. An aerosol generating element according to the invention typically has an ovality of at least approximately 1 percent. Preferably, the aerosol generating element has an ovality of at least 2 percent. More preferably, the aerosol generating element has an ovality of at least 3 percent. Even more preferably, the aerosol generating element has an ovality of at least 4 percent. In some embodiments, the aerosol generating element has an ovality of approximately 1 percent to approximately 30 percent, more preferably from approximately 2 percent to approximately 30 percent, more preferably from approximately 3 percent to approximately 30 percent, still more preferably from approximately 4 percent to approximately 30 percent. In other embodiments, the aerosol generating element has an ovality of approximately 1 percent to approximately 25 percent, more preferably from approximately 2 percent to approximately 25 percent, more preferably from approximately 3 percent to approximately 25 percent, even more preferably from approximately 4 percent to approximately 25 percent. In additional embodiments, the aerosol-generating element has an ovality of approximately 1 percent to approximately 20 percent, more preferably from approximately 2 percent to approximately 30 percent, more preferably of Rfrncnn / zznz / E / YiAi approximately 3 percent to approximately 20 percent, even more preferably from approximately 4 percent to approximately 20 percent. An aerosol generating article according to the present invention may have an exposed surface area to volume ratio of up to 25 cm-1. The expression “surface area exposed to volume ratio”, as used in the present description with reference to the present invention, denotes the ratio between the total external surface area of ​​the aerosol generating element, which is exposed and available for heat and mass exchange, and the total volume of the aerosol generating element. Since the aerosol generating elements according to the invention have low ovality and can be approximated as spherical objects, the volume of an aerosol generating element according to the invention can be expressed by the formula 471 (Yq) volume = ------The exposed surface area of ​​an aerosol generating element according to the invention can be estimated by the formula exposed surface area = 4π (Req) The dimension Req denotes an equivalent radius of the aerosol generating element. Preferably, the aerosol-generating article has an exposed surface area to volume ratio of at least approximately 0.083 cm². More preferably, the aerosol-generating article has an exposed surface area to volume ratio of at least approximately 0.166 cm². Even more preferably, the aerosol-generating article has an exposed surface area to volume ratio of at least approximately 0.249 cm². Rfrncnn / zznz / E / YiAi The aerosol-generating article preferably has an exposed surface area to volume ratio less than or equal to approximately 24 cm⁻¹. More preferably, the aerosol-generating article has an exposed surface area to volume ratio less than or equal to approximately 20 cm⁻¹. Even more preferably, the aerosol-generating article has an exposed surface area to volume ratio less than or equal to approximately 16 cm⁻¹. In some embodiments, the aerosol generating article has an exposed surface area to volume ratio of approximately 0.083 cm'1 to approximately 24 cm-1, more preferably approximately 0.166 cm-1 to approximately 24 cm-1, even more preferably approximately 0.249 cm-1 to approximately 24 cm'1. In other embodiments, the aerosol generating article has an exposed surface area to volume ratio of approximately 0.083 cm'1a approximately 20 cm-1, more preferably approximately 0.166 cm-1a approximately 20 cm-1, even more preferably approximately 0.249 cm-1a approximately 20 cm-1. In additional embodiments, the aerosol generating article has an exposed surface area to volume ratio of approximately 0.083 cm'1 to approximately 16 cm1, more preferably approximately 0.166 cm'1 to approximately 16 cm-1, even more preferably approximately 0.249 cm-1 to approximately 16 cm1. In some embodiments, the aerosol generating elements according to the present invention may be coated. In practice, an external coating layer may optionally be provided on the aerosol generating elements as described above. This may be achieved by means of a coating step that may take place before or after the drying step. An optional drying step may be incorporated after the coating step. Providing a coating layer over the aerosol generating element can be advantageous for many different reasons. For example, a coating layer can Rfrncnn / zznz / E / YiAi advantageously limits the permeation of oxygen or water vapor into the aerosol generating element, which can help extend the element's lifespan. Alternatively or additionally, a coating layer can help protect the structural integrity of the aerosol generating element or provide improved smoothness. In certain embodiments, a relatively brittle coating layer can be added to the aerosol generating element, designed to be broken by the consumer prior to use. This type of coating layer can thus provide the consumer with tactile and audible indication that the aerosol generating element has been activated.Alternatively or additionally, providing a coating layer over the aerosol generating element can be used to adjust the color of the aerosol generating element, for example, to provide a visual indication of a property of the aerosol generating element, such as flavor or nicotine content. The appropriate types of coating material would be known to the expert. For example, a coating layer of a water-soluble film former, such as HPMC or shellac, can be applied to the aerosol-generating element. Such film formers will adhere strongly to the surface of the aerosol-generating element. In a further example, a coating layer of sodium alginate can be added, which will crosslink with any remaining calcium ions on the surface of the aerosol-generating element to form a thin film of calcium alginate. A coating layer can be applied to the external surface of the aerosol-generating element using a variety of coating techniques. A person skilled in the art will be familiar with the appropriate equipment and techniques. Aerosol-generating elements as described above can find use as an aerosol-generating substrate for aerosol-generating articles of the type where the substrate is heated to release an inhalable aerosol, as opposed to articles where Rfrncnn / zznz / E / YiAi a substrate is burned to produce smoke. Since the aerosol generating elements according to the invention are easy to manufacture and predetermined, discrete quantities of an aerosol generating formulation can therefore be provided in encapsulated form, and because the composition of the aerosol generating formulation, especially with regard to the polyhydric alcohol content and the alkaloid or cannabinoid compound, can be precisely adjusted and controlled, the aerosol generating elements according to the invention are versatile and can be used as substrates in a number of arrangements. By way of example, a plurality of aerosol-generating elements according to the invention may be provided within a cavity defined by a tubular element, such that the external surface of the aerosol-generating elements is exposed within the longitudinal airflow channel defined by the cavity. Upon heating, an aerosol may be generated from the aerosol-generating elements, which is therefore released into the airflow channel and can be inhaled through the tubular element into the consumer's mouth. Therefore, aerosol generating elements as described above can be used in an aerosol generating system comprising one or more aerosol generating elements or an aerosol generating article as described above and an electrically operated aerosol generating device. A suitable aerosol generating device comprises a heating element and a heating chamber configured to receive one or more aerosol generating elements or the article such that one or more aerosol generating elements are heated in the heating chamber by the heating element. After heating, the aerosol-generating elements according to the present invention release an aerosol containing the aerosol-generating formulation components, which include, in particular, the polyhydric alcohol and the alkaloid or cannabinoid compound. When an aerosol-generating element according to the present invention is heated to a temperature in the range of approximately 150 degrees Celsius to approximately Rfrncnn / zznz / E / YiAi At 350 degrees Celsius, the aerosol generating element has been found to lose weight without experiencing significant volume contraction. Furthermore, it has been found that when an aerosol generating element according to the present invention is heated to a temperature in the range of approximately 150 degrees Celsius to approximately 350 degrees Celsius, and heat is supplied until no further weight loss is detected, the residual weight of the aerosol generating element is typically less than 120 percent of the weight of the solid continuous matrix structure components, preferably less than 115 percent of the weight of the solid continuous matrix structure components, more preferably less than 115 percent of the weight of the solid continuous matrix structure components, and even more preferably less than 105 percent of the weight of the solid continuous matrix structure components. With the highest preference, when an aerosol generating element according to the present invention is heated to a temperature in the range of approximately 150 degrees Celsius to approximately 350 degrees Celsius, and heat is supplied until no further weight loss is detected, a residual weight of the aerosol generating element corresponds essentially to the total weight of the components of the continuous solid matrix structure. A further embodiment of the invention will now be described, solely by way of example. Example An aerosol-generating solution is formed from a mixture of the following components: Rfrncnn / zznz / E / YiAi Component % by weight Glycerin 43.6 Sodium alginate 2.1 Nicotine 1.2 Levulinic acid 1.4 Water 51.7 Rfrncnn / zznz / E / YiAi In an initial step, sodium alginate is added to water to form a matrix polymer solution. Nicotine is then added, followed by glycerin, and finally, levulinic acid. The resulting aerosol-generating solution is extruded through a 5-millimeter nozzle to form a plurality of droplets, which then fall from a height of 30 centimeters into a crosslinking solution having the following composition at room temperature: Component % by weight Glycerin 42.9 Water 52.1 Calcium chloride 5.0 The droplets are left in the crosslinking solution for 25 minutes before being removed and dried at 25°C for 12 hours in a tray dryer. The resulting dried aerosol-generating elements are in the form of solid, spherical beads approximately 4.6 mm in diameter. Each bead weighs approximately 65 mg, has an aqueous activity of 0.4, and the following composition: Component % by weight Glycerin 76.8 Alginate 3.8 Nicotine 2.4 Levulinic acid 2.1 Water 14.4 Calcium chloride 0.5 Rfrncnn / zznz / E / γΐΛΐ

Claims

1. An aerosol generating element for use in an aerosol generating article or system, the aerosol generating element comprising: a solid continuous matrix structure; and an aerosol generating formulation dispersed within the solid continuous matrix structure, wherein the aerosol generating formulation is trapped within the solid continuous matrix structure and can be released from the solid continuous matrix structure upon heating of the aerosol generating element;wherein the solid continuous matrix structure is a polymeric matrix comprising one or more matrix-forming polymers, and wherein the aerosol-generating formulation dispersed within the solid continuous matrix structure comprises at least one alkaloid or cannabinoid compound and a polyhydric alcohol, wherein the polyhydric alcohol content in the aerosol-generating formulation dispersed within the solid continuous matrix structure represents at least 30 percent by weight based on the total weight of the aerosol-generating element; and wherein the aerosol-generating element has an equivalent diameter of at least approximately 0.5 millimeters and an ovality of approximately 2 percent to approximately 30 percent.

2. An aerosol generating element according to claim 1, wherein the one or more matrix-forming polymers include at least one of alginate and pectin.

3. An aerosol generating element according to claim 1 or 2, wherein the polyhydric alcohol is glycerin, propylene glycol, or a combination of glycerin and propylene glycol.

4. An aerosol generating element according to any of the preceding claims, wherein the polyhydric alcohol content in the dispersed aerosol generating formulation Rfrncnn / zznz / E / YiAi within the solid continuous matrix structure represents at least 60 percent by weight of the total weight of the aerosol generating element.

5. An aerosol generating element according to any of the preceding claims, wherein the aerosol generating formulation dispersed within the solid continuous matrix structure represents at least 80 percent by weight of the total weight of the aerosol generating element.

6. An aerosol generating element according to any of the preceding claims, wherein the content of at least one alkaloid or cannabinoid compound in the aerosol generating formulation dispersed within the solid continuous matrix structure represents at least 0.5 percent by weight of the total weight of the aerosol generating element.

7. An aerosol generating element according to any of the preceding claims, wherein the at least one alkaloid or cannabinoid compound is selected from nicotine, anatabine, cannabidiol (CBD), and tetrahydrocannabinol (THC).

8. An aerosol generating element according to any of the preceding claims, wherein the aerosol generating formulation dispersed within the solid continuous matrix structure further comprises an acid.

9. An aerosol generating element according to claim 8, wherein the acid is lactic acid or levulinic acid.

10. An aerosol generating element according to claim 8 or 9, wherein the acid content in the aerosol generating formulation dispersed within the solid continuous matrix structure represents at least approximately 0.5 percent by weight of the total weight of the aerosol generating element.

11. An aerosol generating element according to any of the preceding claims further comprising less than approximately 20 percent by weight of water.

12. An aerosol generating element according to any of the preceding claims having an equivalent diameter less than or equal to approximately 6 millimeters. Rfrncnn / zznz / E / YiAi 13. An aerosol generating element according to any of the preceding claims having an exposed surface area to volume ratio of approximately 0.083 cm² to approximately 24 cm².