Aerosol-generating article comprising a novel substrate

Abstract

An aerosol-generating article (1)(2) comprises a rod of an aerosol-generating substrate (12)(212), the aerosol-generating substrate (12)(212) comprising at least 60 percent by weight of hemp material on a dry weight basis and one or more aerosol formers applied to the hemp material. The total aerosol former content of the aerosol-generating substrate (12)(212) is less than or equal to 15 percent by weight on a dry weight basis. The hemp material comprises shreds of hemp material derived from one or more parts of the hemp plant.

Description

[0001] P / 90611.W001

[0002] -1-

[0003] AEROSOL-GENERATING ARTICLE COMPRISING A NOVEL SUBSTRATE

[0004] The present invention relates to an aerosol-generating article comprising an aerosolgenerating substrate including hemp material. The present invention further relates to an aerosolgenerating system comprising an aerosol-generating device having a heater element for heating such aerosol-generating articles.

[0005] Aerosol-generating articles in which an aerosol-generating substrate, such as a tobaccocontaining substrate, is heated rather than combusted, are known in the art. Typically in such articles, an aerosol is generated by the transfer of heat from a heat source to a physically separate aerosol-generating substrate or material, 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 substrate by heat transfer from the heat source and are entrained in air drawn through the article. As the released compounds cool, they condense to form an aerosol.

[0006] A number of prior art documents disclose aerosol-generating devices for consuming aerosol-generating articles. Such devices include, for example, electrically heated aerosolgenerating devices in which an aerosol is generated by the transfer of heat from one or more electrical heater elements of the aerosol-generating device to the aerosol-generating substrate of a heated aerosol-generating article. For example, electrically heated aerosol-generating devices have been proposed that comprise an internal heater blade which is adapted to be inserted into the aerosol-generating substrate. Use of an aerosol-generating article in combination with an external heating system is also known. As an alternative, inductively heatable aerosol-generating articles comprising an aerosol-generating substrate and a susceptor arranged within the aerosolgenerating substrate have been proposed.

[0007] Some aerosol-generating articles comprise a flavourant that is delivered to the consumer during use of the article to provide a different sensory experience to the consumer, for example to enhance the flavour of aerosol. A flavourant can be used to deliver a gustatory sensation (taste), an olfactory sensation (smell), or both a gustatory and an olfactory sensation to the user inhaling the aerosol. It is known to provide heated aerosol-generating articles that include flavourants.

[0008] There is an increasing demand for aerosol-generating articles which incorporate an aerosol-generating substrate that can deliver one or more active agents upon heating but which have a reduced or zero level of tobacco. In some cases, active agents can be provided in the form of non-tobacco plant materials.

[0009] It has been found to be difficult to generate a sufficient level of aerosol from substrates containing a relatively high level of non-tobacco plant materials. With such materials, it can also be challenging to provide an acceptable balance of flavour and delivery of active agents from the substrate. It can also be challenging to effectively control the levels of active agents that are delivered, such that a consistent delivery of the active agents can be achieved.

[0010] It would be desirable to provide a novel aerosol-generating substrate for a heated aerosolgenerating article providing a novel sensory experience to the consumer. In particular, it would be desirable to provide a novel aerosol-generating substrate which offers an appealing alternative to tobacco based substrates whilst still providing an optimized delivery of active agent. It would also be desirable to provide such an aerosol-generating substrate that can be readily incorporated into an aerosol-generating article and which can be manufactured using existing high-speed methods and apparatus.

[0011] The present disclosure relates to an aerosol-generating article. The aerosol-generating article may comprise a rod of aerosol-generating substrate. The aerosol-generating substrate may comprise at least 50 percent of a hemp material on a dry weight basis. The aerosolgenerating substrate may comprise one or more aerosol formers applied to the hemp material. The total aerosol former content may be less than or equal to 15 percent by weight on a dry weight basis.

[0012] Further, the present disclosure relates to an aerosol-generating system. The aerosolgenerating system may comprise an aerosol-generating article as described above. The aerosolgenerating system may further comprise an electrically operated aerosol-generating device comprising a heater element configured to heat the aerosol-generating substrate of the aerosolgenerating article.

[0013] According to the present invention there is provided an aerosol-generating article comprising a rod of an aerosol-generating substrate, the aerosol-generating substrate comprising at least 50 percent by weight of hemp material on a dry weight basis and one or more aerosol formers applied to the hemp material, wherein the total aerosol former content is less than or equal to 15 percent by weight on a dry weight basis.

[0014] According to the invention there is provided an aerosol-generating article comprising a rod of an aerosol-generating substrate, the aerosol-generating substrate comprising at least 60 percent by weight of hemp material on a dry weight basis and one or more aerosol formers applied to the hemp material, wherein the total aerosol former content is less than or equal to 15 percent by weight on a dry weight basis and wherein the hemp material comprises shreds of hemp material derived from one or more parts of the hemp plant.

[0015] As used herein, the term “shred of hemp material” refers to an elongate strip or piece of hemp plant material having a length that is greater than its width. The shreds of hemp material may be formed from one or more parts of the hemp plant by any suitable means, for example, by the shredding, tearing or cutting of the hemp plant.

[0016] The one or more parts of the hemp plant may be shredded to form the shreds of hemp material.

[0017] The one or more parts of the hemp plant may be cut to form the shreds of hemp material. Further, according to the present invention there is provided an aerosol-generating system. The aerosol-generating system comprises an aerosol-generating article according to the invention, as described above, and an aerosol-generating device configured to heat the aerosolgenerating substrate of the aerosol-generating article, wherein the aerosol-generating device comprises a housing defining a cavity configured to receive the aerosol-generating article.

[0018] The present invention therefore provides an aerosol-generating article having a novel aerosol-generating substrate, which comprises a relatively large proportion of hemp material. The hemp material provides a primary source of active agents in the aerosol-generating substrate, in the form of cannabinoids and in particular, cannabidiol (CBD). The hemp material may advantageously be the sole source of active agents, or it may be combined with one or more other active agents, or sources of active agent. Advantageously, aerosol-generating articles according to the present invention can be produced with a reduced (or zero) level of tobacco particles, which means that the delivery of undesirable tobacco compounds in the aerosol is minimised or eliminated.

[0019] The use of hemp material in an aerosol-generating substrate has been found to provide an effective way to deliver CBD as an active agent to the consumer and the delivery of CBD from the hemp material can be optimised at relatively low temperatures. An optimised delivery of CBD can also be provided with a relatively low level of aerosol former. The hemp material also provides an aerosol with an appealing flavour profile, which can optionally be enhanced through the use of additional flavourants.

[0020] The aerosol-generating articles of the present invention have been found to provide a relatively high transfer rate of CBD and other cannabinoids from the hemp material in the aerosolgenerating substrate into the aerosol, upon heating of the aerosol-generating substrate in a compatible aerosol-generating device. This means that there is a high level of efficiency in the transfer of CBD and cannabinoids into the aerosol, which optimises the CBD content of the aerosol that is generated from the aerosol-generating substrate.

[0021] In comparison to commercially available non-tobacco aerosol-generating articles, the aerosol-generating articles according to the present invention are found to provide improved volume of aerosol across the duration of heating when the aerosol-generating substrate is heated in a compatible aerosol-generating device. In particular, a relatively high aerosol volume can be provided after the initial puffs and this aerosol volume can be consistently maintained over a number of puffs, for example, over at least 8 or 9 puffs.

[0022] Furthermore, in comparison to commercially available non-tobacco aerosol-generating articles, the aerosol-generating articles of the present invention are found to provide improved intensity of flavour and aroma across the duration of heating when the aerosol-generating substrate is heated in a compatible aerosol-generating device. In particular, a relatively high flavour and aroma intensity can be provided after the initial puffs and this flavour and aroma intensity can be consistently maintained over a number of puffs, for example, over at least 8 or 9 puffs.

[0023] Advantageously, aerosol-generating articles according to the present invention may be manufactured with the same external dimensions as known aerosol-generating articles. Therefore users of aerosol-generating articles according to the invention can use them with existing aerosolgenerating devices. A further advantage of aerosol-generating articles according to the invention is that since the dimensions of the articles are substantially unchanged, they can be packaged in existing packaging solutions. Aerosol-generating articles according to the present invention can be manufactured efficiently and at high speed using existing manufacturing techniques and machinery.

[0024] As used herein, the term “aerosol-generating article” refers to an article wherein an aerosolgenerating substrate is heated to produce and deliver an inhalable aerosol to a consumer.

[0025] As used herein, the term “aerosol-generating substrate” refers to a substrate capable of releasing upon heating volatile compounds, which can form an aerosol. In heated aerosolgenerating articles, an aerosol is generated by heating rather than combusting an aerosolgenerating substrate. Known heated aerosol-generating articles include, for example, electrically heated aerosol-generating articles and aerosol-generating articles in which an aerosol is generated by the transfer of heat from a combustible fuel element or heat source to a physically separate aerosol-generating substrate.

[0026] As used herein, “aerosol-generating device” refers to a device that interacts with an aerosolgenerating substrate to generate an aerosol. Preferably, the aerosol-generating device is a device that interacts with an aerosol-generating substrate to generate an inhalable aerosol that is directly inhalable into a user’s lungs thorough the user's mouth.

[0027] As used herein, “aerosol-generating system” typically refers to the combination of an aerosol-generating device with an aerosol-generating substrate, preferably where the aerosolgenerating substrate is comprised in an aerosol-generating article. In an aerosol-generating system, the aerosol-generating substrate and the aerosol-generating device cooperate to generate an aerosol.

[0028] As used herein with reference to the present disclosure, the term “aerosol” is used to describe 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. The aerosol may include vapours of substances that are ordinarily liquid or solid at room temperature as well as solid particles, or liquid droplets, or a combination of solid particles and liquid droplets.

[0029] As used herein with reference to the present disclosure, the term “hemp material” refers to material derived from the hemp plant, also known as industrial hemp. The hemp plant is a plant of the genus Cannabis sativa L, which is characterised by having a low level of tetrahydrocannabinol (THC). For the purposes of the invention, the hemp material is defined as having a THC content of less than 1 percent by weight on a dry weight basis. Preferably, one or more parts of the hemp plant are cut, chopped, shredded or ground to provide a hemp material having pieces or shreds of hemp material with a desired cut width or particle size, as described in more detail below. For the purposes of the invention, hemp extracts or compounds derived from hemp plants do not constitute the “hemp material” of the aerosol-generating substrate. In some embodiments, hemp extracts may be added to the aerosol-generating substrate separately to the hemp material, as described below.

[0030] As used herein, “dry weight” refers to the weight of a particular non-water component relative to the sum of the weights of all non-water components in a mixture, expressed as a percentage. The composition of aqueous mixtures may be referred to by “percentage dry weight.” This refers to the weight of the non-water components relative to the weight of the entire aqueous mixture, expressed as a percentage.

[0031] According to the present invention, the total content of hemp material in the aerosolgenerating substrate of aerosol-generating articles according to the present invention is at least 50 percent by weight, on a dry weight basis. Preferably, the aerosol-generating substrate comprises at least 60 percent by weight of hemp material, more preferably at least 65 percent by weight of hemp material, more preferably at least 70 percent by weight of hemp material, more preferably at least 75 percent by weight of hemp material, on a dry weight basis.

[0032] Preferably, the aerosol-generating substrate comprises less than or equal to 98 percent by weight of hemp material, more preferably less than or equal to 95 percent by weight of hemp material, more preferably less than or equal to 92 percent by weight of hemp material, more preferably less than or equal to 90 percent by weight of hemp material, on a dry weight basis.

[0033] For example, the aerosol-generating substrate may comprise between 50 percent by weight and 98 percent by weight of hemp material, or between 50 percent by weight and 95 percent by weight of hemp material, or between 50 percent by weight and 92 percent by weight of hemp material, or between 50 percent by weight and 90 percent by weight of hemp material, on a dry weight basis.

[0034] For example, the aerosol-generating substrate may comprise between 60 percent by weight and 98 percent by weight of hemp material, or between 60 percent by weight and 95 percent by weight of hemp material, or between 60 percent by weight and 92 percent by weight of hemp material, or between 60 percent by weight and 90 percent by weight of hemp material, on a dry weight basis.

[0035] For example, the aerosol-generating substrate may comprise between 65 percent by weight and 98 percent by weight of hemp material, or between 65 percent by weight and 95 percent by weight of hemp material, or between 65 percent by weight and 92 percent by weight of hemp material, or between 65 percent by weight and 90 percent by weight of hemp material, on a dry weight basis.

[0036] For example, the aerosol-generating substrate may comprise between 70 percent by weight and 98 percent by weight of hemp material, or between 70 percent by weight and 95 percent by weight of hemp material, or between 70 percent by weight and 92 percent by weight of hemp material, or between 70 percent by weight and 90 percent by weight of hemp material, on a dry weight basis.

[0037] For example, the aerosol-generating substrate may comprise between 75 percent by weight and 98 percent by weight of hemp material, or between 75 percent by weight and 95 percent by weight of hemp material, or between 75 percent by weight and 92 percent by weight of hemp material, or between 75 percent by weight and 90 percent by weight of hemp material, on a dry weight basis.

[0038] The hemp material may comprise hemp material derived from one or more parts of the hemp plant. Preferably, the hemp material comprises hemp flowers or portions of hemp flowers. Particularly preferably, the hemp material comprises shredded hemp flowers, cut hemp flowers, or a combination thereof. The hemp material may comprise hemp buds or portions of hemp buds. The hemp material may comprise hemp leaves, hemp seeds or a combination thereof.

[0039] The hemp material may be dried hemp material which has been dried to reduce its moisture content prior to incorporation in the aerosol-generating article. For example, in certain preferred embodiments, the hemp material is freeze dried hemp material. Freeze drying of the hemp material prior to cutting or shredding has been found to advantageously improve the machineability of the hemp material and in particular, to make it easier to cut or shred. In other preferred embodiments, the hemp material is air dried hemp material.

[0040] The hemp material may have a water content of less than or equal to 15 percent by weight, less than or equal to 14 percent by weight, less than or equal to 13 percent by weight, less than or equal to 12 percent by weight, or less than or equal to 10 percent by weight.

[0041] The hemp material may have a water content of at least 4 percent by weight, or at least 5 percent by weight, or at least 6 percent by weight, or at least 7 percent by weight.

[0042] For example, the hemp material may have a water content of between 4 percent by weight and 15 percent by weight, or between 5 percent by weight and 14 percent by weight, or between 6 percent by weight and 13 percent by weight, or between 7 percent by weight and 12 percent by weight, or between 7 percent by weight and 10 percent by weight.

[0043] The aerosol-generating substrate may optionally comprise tobacco material, such as shredded tobacco material, in addition to the hemp material defined above. However, preferably the level of tobacco material is relatively low. Preferably, the aerosol-generating substrate comprises less than or equal to 10 percent by weight of tobacco material, on a dry weight basis. More preferably, the aerosol-generating substrate comprises less than or equal to 5 percent by weight of tobacco material, on a dry weight basis. More preferably, the aerosol-generating substrate comprises less than 2 percent by weight of tobacco material, on a dry weight basis. More preferably, the aerosol-generating substrate comprises less than 1 percent by weight of tobacco material, on a dry weight basis. In some preferred embodiments of the present invention, the aerosol-generating substrate is substantially free from tobacco, or free from tobacco.

[0044] The aerosol-generating substrate may optionally comprise additional non-tobacco plant material from one or more non-tobacco plants other than hemp. For example, the aerosolgenerating substrate may optionally comprise non-tobacco plant material from one or more of: clove, star anise, rosemary, peppermint, sage, chamomile, and lavender. The combination of non-tobacco plant material with the hemp material may advantageously provide additional flavours in the aerosol generated from the aerosol-generating substrate.

[0045] For example, the aerosol-generating substrate may comprise at least 2 percent by weight of additional non-tobacco plant material, more preferably at least 5 percent by weight of additional non-tobacco plant material, on a dry weight basis. The aerosol-generating substrate may comprise less than or equal to 15 percent by weight of additional non-tobacco plant material, preferably less than or equal to 10 percent by weight of additional non-tobacco plant material, on a dry weight basis.

[0046] For example, the aerosol-generating substrate may comprise between 2 percent by weight and 15 percent by weight of additional non-tobacco plant material, or between 2 percent by weight and 10 percent by weight of additional non-tobacco plant material, or between 5 percent by weight and 15 percent by weight of additional non-tobacco plant material, or between 5 percent by weight and 10 percent by weight of additional non-tobacco plant material, on a dry weight basis.

[0047] As described above, the hemp material provides cannabidiol (CBD) as an active agent, wherein a proportion of the CBD is released into the aerosol generated upon heating of the aerosol-generating substrate.

[0048] Preferably, the aerosol-generating substrate comprises at least 5 percent by weight of CBD, more preferably at least 6 percent by weight of CBD, more preferably at least 8 percent by weight of CBD, more preferably at least 10 percent by weight of CBD, on a dry weight basis.

[0049] The aerosol-generating substrate may comprise less than or equal to 25 percent by weight of CBD, preferably less than or equal to 20 percent by weight of CBD, more preferably less than or equal to 15 percent by weight of CBD, on a dry weight basis.

[0050] For example, the aerosol-generating substrate may comprise between 5 percent by weight and 25 percent by weight of CBD, or between 5 percent by weight and 20 percent by weight of CBD, or between 5 percent by weight and 15 percent by weight of CBD, on a dry weight basis.

[0051] For example, the aerosol-generating substrate may comprise between 6 percent by weight and 25 percent by weight of CBD, or between 6 percent by weight and 20 percent by weight of CBD, or between 6 percent by weight and 15 percent by weight of CBD, on a dry weight basis.

[0052] For example, the aerosol-generating substrate may comprise between 8 percent by weight and 25 percent by weight of CBD, or between 8 percent by weight and 20 percent by weight of CBD, or between 8 percent by weight and 15 percent by weight of CBD, on a dry weight basis. For example, the aerosol-generating substrate may comprise between 10 percent by weight and 25 percent by weight of CBD, or between 10 percent by weight and 20 percent by weight of CBD, or between 10 percent by weight and 15 percent by weight of CBD, on a dry weight basis.

[0053] Preferably, the total CBD content of the rod of aerosol-generating substrate is at least 5 milligrams, more preferably at least 7.5 milligrams and more preferably at least 10 milligrams.

[0054] Preferably, the total CBD content of the rod of aerosol-generating substrate is less than or equal to 20 milligrams, preferably less than or equal to 17.5 milligrams, preferably less than or equal to 15 milligrams.

[0055] For example, the total CBD content of the rod of aerosol-generating substrate may be between 5 milligrams and 20 milligrams, or between 7.5 milligrams and 17.5 milligrams, or between 10 milligrams and 15 milligrams.

[0056] As defined above, the hemp material used in the aerosol-generating articles according to the invention comprises less than 1 percent by weight of tetrahydrocannabinol (THC) on a dry weight basis.

[0057] Preferably, the aerosol-generating substrate therefore comprises less than or equal to 0.9 percent by weight of THC, more preferably less than or equal to 0.8 percent by weight of THC, more preferably less than or equal to 0.7 percent by weight of THC, more preferably less than or equal to 0.6 percent by weight of THC, on a dry weight basis.

[0058] The aerosol-generating substrate may comprise at least 0.1 percent by weight of THC, or at least 0.2 percent by weight of THC, or at least 0.5 percent by weight of THC, on a dry weight basis.

[0059] The aerosol-generating substrate of aerosol-generating articles according to the invention therefore preferably maximises the weight ratio of CBD to THC, in order to optimise the composition of the aerosol generated upon heating of the aerosol-generating substrate.

[0060] Preferably, the weight ratio of cannabidiol (CBD) to tetrahydrocannabinol (THC) in the aerosol-generating substrate is at least 15, more preferably at least 18, more preferably at least 20.

[0061] The weight ratio of cannabidiol (CBD) to tetrahydrocannabinol (THC) in the aerosolgenerating substrate may be less than or equal to 30, or less than or equal to 25.

[0062] For example, the weight ratio of cannabidiol (CBD) to tetrahydrocannabinol (THC) in the aerosol-generating substrate may be between 15 and 30, or between 18 and 30, or between 20 and 30, or between 15 and 25, or between 18 and 25, or between 20 and 25.

[0063] The hemp material contains a relatively large number of other cannabinoid compounds in addition to CBD and THC, for example, cannabinol (CBN), cannbigerol (CBG) and cannabichromene (CBC). These other cannabinoid compounds are all provided at a relatively low level compared to the level of CBD. Preferably, the aerosol-generating substrate has a total cannabinoid content of at least 6 percent by weight, more preferably at least 8 percent by weight, more preferably at least 10 percent by weight, more preferably at least 12 percent by weight, on a dry weight basis.

[0064] The aerosol-generating substrate may have a total cannabinoid content of less than or equal to 25 percent by weight, preferably less than or equal to 20 percent by weight, more preferably less than or equal to 15 percent by weight, on a dry weight basis.

[0065] For example, the aerosol-generating substrate may have a total cannabinoid content of between 6 percent by weight and 25 percent by weight, or between 8 percent by weight and 20 percent by weight, or between 10 percent by weight and 15 percent by weight, on a dry weight basis.

[0066] According to the invention, the aerosol-generating substrate comprises less than or equal to 15 percent by weight of aerosol former, on a dry weight basis. The aerosol-generating substrate may comprise one or more aerosol formers, which are applied to the hemp material. The one or more aerosol formers may be applied to the hemp material using any suitable means, for example, by spraying.

[0067] Suitable aerosol formers for inclusion in the aerosol-generating substrate are known in the art and include, but are not limited to: polyhydric alcohols, such as triethylene glycol, propylene glycol, 1 ,3-butanediol and glycerol; esters of polyhydric alcohols, such as glycerol mono-, di- or triacetate; and aliphatic esters of mono-, di- or polycarboxylic acids, such as dimethyl dodecanedioate and dimethyl tetradecanedioate. Preferably, the aerosol former comprises one or more of glycerol and propylene glycol. The aerosol former may consist of glycerol or propylene glycol or of a combination of glycerol and propylene glycol.

[0068] The aerosol-generating substrate preferably has an aerosol former content of less than or equal to 12 percent by weight on a dry weight basis. More preferably, the aerosol-generating substrate has an aerosol former content of less than or equal to 10 percent by weight on a dry weight basis.

[0069] Preferably, the aerosol-generating substrate has a total aerosol former content of at least 2 percent by weight on a dry weight basis. More preferably, the aerosol-generating substrate has a total aerosol former content of at least 3 percent by weight on a dry weight basis. More preferably, the aerosol-generating substrate has a total aerosol former content of at least 4 percent by weight on a dry weight basis.

[0070] For example, the total aerosol former content of the aerosol-generating substrate is preferably between 2 percent and 15 percent by weight, or between 2 percent and 12 percent by weight, or between 2 percent and 10 percent by weight, on a dry weight basis.

[0071] For example, the total aerosol former content of the aerosol-generating substrate is preferably between 3 percent and 15 percent by weight, or between 3 percent and 12 percent by weight, or between 3 percent and 10 percent by weight, on a dry weight basis. For example, the total aerosol former content of the aerosol-generating substrate is preferably between 4 percent and 15 percent by weight, or between 4 percent and 12 percent by weight, or between 4 percent and 10 percent by weight, on a dry weight basis.

[0072] Preferably, the aerosol-generating substrate comprises glycerol as an aerosol former. For example, the aerosol-generating substrate may comprise between 2 percent and 15 percent by weight of glycerol, or between 3 percent and 12 percent by weight of glycerol, or between 4 percent and 10 percent by weight of glycerol, on a dry weight basis.

[0073] The aerosol-generating substrate of aerosol-generating articles according to the invention may consist of the hemp material and the aerosol former. Alternatively, the aerosol-generating substrate may include one or more additional components. For example, the aerosol-generating substrate may comprise one or more of: flavourants, acids, binders, fillers and active agents.

[0074] In certain embodiments of the invention, the aerosol-generating substrate comprises one or more flavourants. Suitable flavourants would be known to the skilled person. The one or more flavourants may comprise one or more of: one or more essential oils such as eugenol, peppermint oil and spearmint oil; one or both of menthol and eugenol; one or both of anethole and linalool.

[0075] The aerosol-generating substrate may have a flavourant content of at least 0.5 percent by weight, preferably at least 1 percent by weight, more preferably at least 2 percent by weight, on a dry weight basis.

[0076] The aerosol-generating substrate may have a flavourant content of less than or equal to 10 percent by weight, preferably less than or equal to 8 percent by weight, more preferably less than or equal to 5 percent by weight, on a dry weight basis.

[0077] For example, the aerosol-generating substrate may have a flavourant content of between 0.5 percent and 10 percent by weight, or between 1 percent and 8 percent by weight, or between 2 percent and 5 percent by weight, on a dry weight basis.

[0078] In certain embodiments, the aerosol-generating substrate may comprise a hemp terpene extract. The use of a terpene extract which has been derived from hemp material may advantageously enhance the characteristic hemp flavours in the aerosol generated from the aerosol-generating substrate. Alternatively or in addition to the inclusion of a hemp terpene extract in the aerosol-generating substrate, a hemp terpene extract may be provided at one or more other locations in the aerosol-generating article, for example in a downstream component of the aerosol-generating article or in a wrapper.

[0079] Alternatively or in addition, the aerosol-generating substrate may comprise one or more acids, for example, one or more carboxylic acids. Suitable carboxylic acids include but are not limited to: fumaric acid, maleic acid, malic acid, adipic acid, succinic acid, lactic acid, levulinic acid, acetic acid, benzoic acid, citric acid.

[0080] The inclusion of one or more acids may help to control the sensorial properties of the aerosol generated from the aerosol-generating substrate upon heating. The aerosol-generating substrate may have an acid content of at least 0.5 percent by weight, preferably at least 0.75 percent by weight, more preferably at least 1 percent by weight on a dry weight basis.

[0081] The aerosol-generating substrate may have an acid content of less than or equal to 3 percent by weight, preferably less than or equal to 2.5 percent by weight, more preferably less than or equal to 2 percent by weight, on a dry weight basis.

[0082] For example, the aerosol-generating substrate may have an acid content of between 0.5 percent and 3 percent by weight, or between 0.75 and 2.5 percent by weight, or between 1 percent and 2 percent by weight, on a dry weight basis.

[0083] Alternatively or in addition, the aerosol-generating substrate may comprise one or more binders. Suitable binders include but are not limited to: gums such as, for example, guar gum, xanthan gum, arabic gum and locust bean gum; cellulosic binders such as, for example, hydroxypropyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, methyl cellulose and ethyl cellulose; polysaccharides such as, for example, starches, organic acids, such as alginic acid, conjugate base salts of organic acids, such as sodium-alginate, agar and pectins; and combinations thereof.

[0084] The aerosol-generating substrate may have a binder content of at least 0.5 percent by weight, preferably at least 1 percent by weight, more preferably at least 2 percent by weight on a dry weight basis.

[0085] The aerosol-generating substrate may have a binder content of less than or equal to 10 percent by weight, preferably less than or equal to 7.5 percent by weight, more preferably less than or equal to 5 percent by weight, on a dry weight basis.

[0086] For example, the aerosol-generating substrate may have a binder content of between 0.5 percent and 10 percent by weight, or between 1 and 7.5 percent by weight, or between 2 percent and 5 percent by weight, on a dry weight basis.

[0087] The hemp material in the aerosol-generating substrate may take any suitable form. Preferably, the hemp material is processed to reduce the size of the pieces or particles of hemp material in the aerosol-generating substrate. This may facilitate the formation of a rod of aerosolgenerating substrate from the hemp material.

[0088] The hemp material may comprise shredded hemp material. In such embodiments, the shredded hemp material provides shreds of hemp material in the aerosol-generating substrate.

[0089] The shredded hemp material may have a cut width of at least 0.5 millimetres, at least 0.6 millimetres, at least 0.75 millimetres, or at least 1 millimetre.

[0090] The cut width of the shredded hemp material may be less than or equal to 6.25 millimetres, less than or equal to 5 millimetres, less than or equal to 4 millimetres, less than or equal to 3 millimetres, or less than or equal to 2 millimetres.

[0091] For example, the shredded hemp material may have a cut width of between 0.5 millimetres and 6.25 millimetres, or between 0.6 millimetres and 5 millimetres, or between 0.75 millimetre and 4 millimetres, or between 1 millimetre and 3 millimetres, or between 1 millimetre and 2 millimetres. In some preferred embodiments, the cut width of the shredded hemp material is about 1 millimetre.

[0092] The hemp material may comprise cut hemp material. In such embodiments, the cut hemp material provides shreds of hemp material in the aerosol-generating substrate.

[0093] The cut hemp material may have a cut width of at least 0.5 millimetres, at least 0.6 millimetres, at least 0.75 millimetres, or at least 1 millimetre.

[0094] The cut width of the cut hemp material may be less than or equal to 6.25 millimetres, less than or equal to 5 millimetres, less than or equal to 4 millimetres, less than or equal to 3 millimetres, or less than or equal to 2 millimetres.

[0095] For example, the cut hemp material may have a cut width of between 0.5 millimetres and 6.25 millimetres, or between 0.6 millimetres and 5 millimetres, or between 0.75 millimetre and 4 millimetres, or between 1 millimetre and 3 millimetres, or between 1 millimetre and 2 millimetres. In some preferred embodiments, the cut width of the shredded hemp material is about 1 millimetre.

[0096] The cut width may play a role in the distribution of heat inside the rod of aerosol-generating substrate. Also, the cut width may play a role in the resistance to draw of the article. Further, the cut width may impact the overall density of the aerosol-generating substrate as a whole.

[0097] The hemp material may comprise ground hemp material comprising a plurality of particles of hemp material.

[0098] The particles of hemp material may have an average particle size of at least 50 microns, or at least 75 microns, or at least 100 microns, or at least 200 microns.

[0099] The particles of hemp material may have an average particle size of less than or equal to 1 millimetre, or less than or equal to 800 microns, or less than or equal to 600 microns, or less than or equal to 400 microns.

[0100] For example, the particles of hemp material may have an average particle size of between 50 microns and 1 millimetre, or between 75 microns and 800 microns, or between 100 microns and 600 microns, or between 200 microns and 400 microns.

[0101] Preferably, the rod of aerosol-generating substrate has a weight of less than or equal to 300 milligrams. More preferably, the rod of aerosol-generating substrate has a weight of less than or equal to 250 milligrams. More preferably, the rod of aerosol-generating substrate has a weight of less than or equal to 220 milligrams.

[0102] Preferably, the rod of aerosol-generating substrate has a weight of at least 100 milligrams, more preferably a weight of at least 105 milligrams, more preferably a weight of at least 110 milligrams.

[0103] Preferably, the rod of aerosol-generating substrate has a weight of less than or equal to 130 milligrams, more preferably less than or equal to 125 milligrams, more preferably less than or equal to 120 milligrams. For example, the rod of aerosol-generating substrate preferably has a weight of between 100 milligrams and 130 milligrams, or between 105 milligrams and 125 milligrams, or between 110 milligrams and 120 milligrams.

[0104] Preferably, the aerosol-generating substrate of aerosol-generating articles according to the present invention has a density of at least 200 milligrams per cubic centimetre. More preferably, the aerosol-generating substrate has a density of at least 210 milligrams per cubic centimetre.

[0105] More preferably, the aerosol-generating substrate has a density of at least 220 milligrams per cubic centimetre. More preferably, the aerosol-generating substrate has a density of at least 230 milligrams per cubic centimetre.

[0106] Preferably, the aerosol-generating substrate of aerosol-generating articles according to the present invention has a density of less than or equal to 300 milligrams per cubic centimetre. More preferably, the aerosol-generating substrate has a density of less than or equal to 280 milligrams per cubic centimetre. More preferably, the aerosol-generating substrate has a density of less than or equal to 270 milligrams per cubic centimetre. More preferably, the aerosol-generating substrate has a density of less than or equal to 260 milligrams per cubic centimetre.

[0107] For example, the aerosol-generating substrate may have a density of between 200 milligrams per cubic centimetre and 300 milligrams per cubic centimetre, or between 210 milligrams per cubic centimetre and 280 milligrams per cubic centimetre, or between 220 milligrams per cubic centimetre and 270 milligrams per cubic centimetre, or between 230 milligrams per cubic centimetre and 260 milligrams per cubic centimetre.

[0108] The term “density” as used herein in relation to the aerosol-generating substrate refers to the bulk density of the aerosol-generating substrate. This can be calculated by measuring the total weight of the aerosol-generating substrate and dividing this by the volume of the rod of aerosol-generating substrate (excluding any wrapper).

[0109] The resistance to draw (RTD) of the rod of aerosol-generating substrate is preferably less than or equal to about 100 millimetres H2O. More preferably, the RTD of the rod of aerosolgenerating substrate is less than or equal to about 90 millimetres H2O. More preferably, the RTD of the rod of aerosol-generating substrate is less than or equal to about 80 millimetres H2O. More preferably, the RTD of the rod of aerosol-generating substrate is less than or equal to about 70 millimetres H2O.

[0110] The RTD of the rod of aerosol-generating substrate is preferably at least about 20 millimetres H2O. More preferably, the RTD of the rod of aerosol-generating substrate is at least about 30 millimetres H2O. More preferably, the RTD of the rod of aerosol-generating substrate is at least about 40 millimetres H2O. More preferably, the RTD of the rod of aerosol-generating substrate is at least about 50 millimetres H2O.

[0111] For example, the RTD of the rod of aerosol-generating substrate may be between 20 millimetres H2O and 100 millimetres H2O, or between 30 millimetres H2O and 90 millimetres H2O, or between 40 millimetres H2O and 80 millimetres H2O, or between 50 millimetres H2O and 70 millimetres H2O.

[0112] Preferably, the rod of aerosol-generating substrate has an RTD of at least 2 millimetres H2O per millimetre of length, more preferably at least 3 millimetres H2O per millimetre of length, more preferably at least 4 millimetres H2O per millimetre of length.

[0113] Preferably, the rod of aerosol-generating substrate has an RTD of less than or equal to 10 millimetres H2O per millimetre of length, more preferably less than or equal to 8 millimetres H2O per millimetre of length, more preferably less than or equal to 6 millimetres H2O per millimetre of length.

[0114] For example, the rod of aerosol-generating substrate may have an RTD of between 2 millimetres H2O and 10 millimetres H2O per millimetre of length, or between 3 millimetres H2O and 8 millimetres H2O per millimetre of length, or between 4 millimetres H2O and 6 millimetres H2O per millimetre of length.

[0115] Unless otherwise stated, the resistance to draw (RTD) of the aerosol-generating article or a component of the aerosol-generating article is measured in accordance with ISO 6565-2015 at a volumetric flow rate of 17.5 millilitres per second at the proximal end of the aerosol-generating article or the component thereof at a temperature of 22 degrees Celsius, a pressure of 101 kPa (760 Torr) and a relative humidity of 60%.

[0116] Upon heating, the aerosol-generating substrate of aerosol-generating articles according to the present invention generated an aerosol containing cannabidiol (CBD) and a plurality of other cannabinoids.

[0117] Preferably, upon heating the aerosol-generating substrate in a Tobacco Heating System

[0118] 6.0 device under the Health Canada machine-smoking regimen, an aerosol is generated comprising at least 30 milligrams of cannabidiol (CBD) per gram of the aerosol-generating substrate, more preferably at least 35 milligrams of CBD per gram of aerosol-generating substrate, more preferably at least 40 milligrams of CBD per gram of aerosol-generating substrate, more preferably at least 45 milligrams of CBD per gram of aerosol-generating substrate.

[0119] The aerosol generated may comprise up to 100 milligrams of CBD per gram of aerosolgenerating substrate, or up to 75 milligrams of CBD per gram of aerosol-generating substrate.

[0120] The Tobacco Heating System 6.0 device (THS 6.0) corresponds to the commercially available BONDS by IQOS device (Philip Morris Products SA, Switzerland).

[0121] The Health Canada smoking regimen is a well-defined and accepted smoking protocol as defined in Health Canada 2000 - Tobacco Products Information Regulations SOR / 2000-273, Schedule 2; published by Ministry of Justice Canada. The test method is described in ISO / TR 19478-1 :2014. In a Health Canada smoking test, an aerosol is collected from the sample aerosolgenerating substrate over 12 puffs with a puff volume of 55 millimetres, puff duration of 2 seconds and puff interval of 30 seconds, with all ventilation blocked if ventilation is present. For the purposes of analysis, the aerosol generated from the heating of the aerosolgenerating substrate is trapped using suitable apparatus and analysed using LC-MS / MS apparatus.

[0122] Preferably, upon heating of the aerosol-generating substrate in a Tobacco Heating System 6.0 device (THS 6.0) under the Health Canada machine-smoking regimen, the aerosol generated from the aerosol-generating substrate comprises CBD in an average amount of at least 0.15 milligrams per puff, more preferably at least 0.2 milligrams per puff, more preferably at least 0.25 milligrams per puff.

[0123] The aerosol generated may comprise CBD in an average amount of up to 0.5 milligrams per puff, or up to 0.4 milligrams per puff.

[0124] Preferably, upon heating the aerosol-generating substrate in a Tobacco Heating System 6.0 device (THS 6.0) under the Health Canada machine-smoking regimen, an aerosol is generated comprising cannabidiol (CBD), wherein the amount of cannabidiol (CBD) in the aerosol corresponds to at least 0.25 times the amount of CBD in the aerosol-generating substrate prior to heating. This corresponds to a CBD transfer rate of 25 percent. More preferably, the amount of cannabidiol (CBD) in the aerosol corresponds to at least 0.3 times the amount of CBD in the aerosol-generating substrate prior to heating, more preferably at least 0.35 times the amount of CBD in the aerosol-generating substrate prior to heating.

[0125] The amount of CBD in the aerosol generated may be up to 0.75 times the amount of CBD in the aerosol-generating substrate prior to heating, or up to 0.6 times the amount of CBD in the aerosol-generating substrate prior to heating.

[0126] The CBD present within the hemp material of the aerosol-generating substrate of aerosolgenerating articles according to the invention is therefore very efficiently transferred into the aerosol upon heating of the aerosol-generating substrate according to the conditions described above. This enables the delivery of CBD to the consumer to be optimised.

[0127] In some preferred embodiments, the rod of aerosol-forming substrate further comprises a heating element arranged to heat the aerosol-generating substrate. The heating element may be one or more susceptor elements. The aerosol-generating substrate may comprise one or more elongate susceptor elements.

[0128] In some preferred embodiments, the rod of aerosol-generating substrate has a length of less than or equal to 20 millimetres. More preferably, the rod of aerosol-generating substrate has a length of less than or equal to 18 millimetres. More preferably, the rod of aerosol-generating substrate has a length of less than or equal to 15 millimetres. More preferably, the rod of aerosol generating substrate has a length of less than or equal to 14 millimetres. More preferably, the rod of aerosol-generating substrate has a length of less or equal to than 13 millimetres.

[0129] Preferably, the rod of aerosol-generating substrate has a length of at least 6 millimetres. More preferably, the rod of aerosol-generating substrate has a length of at least 10 millimetres. For example, the rod of aerosol-generating substrate has a length of between 6 millimetres and 20 millimetres, or between 6 millimetres and 18 millimetres, or between 6 millimetres and 15 millimetres, or between 6 millimetres and 14 millimetres, or between 6 millimetres and 13 millimetres, or between 10 millimetres and 18 millimetres, or between 10 millimetres and 15 millimetres, or between 10 millimetres and 14 millimetres, or between 10 millimetres and 13 millimetres.

[0130] As used herein, “length” refers to the maximum dimension of a feature in a longitudinal direction of the feature. The term “length” denotes the dimension of a component of the aerosolgenerating article in the longitudinal direction, from the component’s furthest upstream point to the component’s furthest downstream point. For example, it may be used to denote the dimension of aerosol-generating substrate or of any elongate tubular elements in the longitudinal direction.

[0131] In some preferred embodiments, a ratio of the length of the rod of aerosol-generating substrate to the length of the aerosol-generating article is less than 0.4. More preferably, the ratio of the length of the rod of aerosol-generating substrate to the length of the aerosol-generating article is less than 0.35. More preferably, the ratio of the length of the rod of aerosol-generating substrate to the length of the aerosol-generating article is less than 0.3. Preferably, the ratio of the length of the rod of aerosol-generating substrate to the length of the aerosol-generating article is at least 0.15. More preferably, the ratio of the length of the rod of aerosol-generating substrate to the length of the aerosol-generating article is at least 0.2. More preferably, the ratio of the length of the rod of aerosol-generating substrate to the length of the aerosol-generating article is at least 0.25. More preferably, the ratio of the length of the rod of aerosol-generating substrate to the length of the aerosol-generating article is at least 0.3.

[0132] For example, the ratio of the length of the rod of aerosol-generating substrate to the length of the aerosol-generating article may be between 0.15 and 0.4, or between 0.2 and 0.35, or between 0.25 and 0.3, or between 0.3 and 0.4.

[0133] The rod of aerosol-generating substrate preferably has an external diameter that is approximately equal to the external diameter of the aerosol-generating article.

[0134] The “external diameter of the rod of aerosol-generating substrate” may be calculated as the average of a plurality of measurements of the diameter of the rod of aerosol-generating substrate taken at different locations along the length of the rod of aerosol-generating substrate.

[0135] The rod of aerosol-generating substrate may have an external diameter of at least 5 millimetres, at least 6 millimetres, or at least 7 millimetres.

[0136] The rod of aerosol-generating substrate may have an external diameter of less than or equal to 12 millimetres, less than or equal to 10 millimetres, or less than or equal to 8 millimetres.

[0137] For example, the rod of aerosol-generating substrate may have an external diameter of between 5 millimetres and 12 millimetres, or between 6 millimetres and 10 millimetres, or between 7 millimetres and 8 millimetres. In particularly preferred embodiments, the rod of aerosol-generating substrate has an external diameter of less than about 7.5 millimetres. By way of example, the rod of aerosolgenerating substrate may an external diameter of about 7.2 millimetres.

[0138] A ratio of the length of the rod of aerosol-generating substrate to the external diameter of the rod of aerosol-generating substrate may be less than or equal to 2.5, less than or equal to 2, less than or equal to 2, or less than or equal to 1.8.

[0139] A ratio of the length of the rod of aerosol-generating substrate to the external diameter of the rod of aerosol-generating substrate may be at least 1 , or at least 1.25, or at least 1.5.

[0140] Preferably, the aerosol-generating articles according to the present invention further comprise a paper wrapper circumscribing the rod of aerosol-generating substrate.

[0141] Preferably, the paper wrapper has a thickness of at least 25 micrometres, more preferably at least 30 micrometres, more preferably at least 35 micrometres. The paper wrapper may have a thickness of less than or equal to 60 micrometres, preferably less than or equal to 50 micrometres, more preferably less than or equal to 40 micrometres. For example, the paper wrapper may have a thickness from 25 micrometres to 60 micrometres, preferably from 30 micrometres to 50 micrometres, more preferably from 35 micrometres to 40 micrometres. In a preferred embodiment, the paper wrapper may have a thickness of 37 micrometres.

[0142] Preferably, the paper wrapper has a grammage of at least 15 gsm (grams per square metre), more preferably at least 20 gsm, more preferably at least 30 gsm. The paper wrapper may have a grammage of less than or equal to 60 gsm, preferably less than or equal to 50 gsm, preferably less than or equal to 40 gsm. For example, the paper wrapper may have a grammage from 15 gsm to 60 gsm, preferably from 20 gsm to 50 gsm, more preferably from 30 gsm to 40 gsm.

[0143] Preferably, the paper wrapper is a substantially non-porous wrapper.

[0144] Preferably, the rod of aerosol-generating substrate is wrapped in a hydrophobic wrapper.

[0145] The term “hydrophobic” refers to a surface exhibiting water repelling properties. One useful way to determine this is to measure the water contact angle. The “water contact angle” is the angle, conventionally measured through the liquid, where a liquid / vapour interface meets a solid surface. It quantifies the wettability of a solid surface by a liquid via the Young equation. Hydrophobicity or water contact angle may be determined by utilizing TAPPI T558 test method and the result is presented as an interfacial contact angle and reported in “degrees” and can range from near zero to near 180 degrees.

[0146] In preferred embodiments, the hydrophobic wrapper is one including a paper layer having a water contact angle of about 30 degrees or greater, and preferably about 35 degrees or greater, or about 40 degrees or greater, or about 45 degrees or greater.

[0147] By way of example, the paper layer may comprise a layer of comprise PVOH (polyvinyl alcohol) or silicon on its inner surface. The PVOH may be applied to the paper layer as a surface coating, or the paper layer may comprise a surface treatment comprising PVOH or silicon. The aerosol-generating article may comprise one of more additional wrappers. Suitable wrappers for use in aerosol-generating articles according to the invention are known in the art and include, but are not limited to: cigarette papers; filter plug wraps; tipping papers; metallised papers; metal foils; and metal foil-paper laminates.

[0148] The aerosol-generating article may have any desired shape. For example, the aerosolgenerating article may be substantially cylindrical.

[0149] The aerosol-generating article may have any desired transverse cross-section. For example, the aerosol-generating article may have a substantially circular, oval or elliptical transverse cross-section.

[0150] The aerosol-generating article may have any desired length. For example, the aerosolgenerating article may have a length of between 30 millimetres and 70 millimetres, between 35 millimetres and 65 millimetres, or between 40 millimetres and 60 millimetres.

[0151] The aerosol-generating article may have any desired width. For example, the aerosolgenerating article may have a width of between 5 millimetres and 10 millimetres, between 6 millimetres and 9 millimetres, or between 7 millimetres and 8 millimetres.

[0152] The aerosol-generating article may include one or more additional components.

[0153] The one or more other components may include one or more of an upstream element and a downstream element. The downstream element preferably comprises at least one hollow tubular element abutting a downstream end of the rod of aerosol-generating substrate. The downstream element may comprise one or more of: a support element, an aerosol-cooling element and a mouthpiece element.

[0154] The aerosol-generating article may comprise an upstream element located at the distal end of the aerosol-generating article. The upstream element may be located immediately upstream of the solid aerosol-generating substrate.

[0155] The upstream element may advantageously prevent direct contact with the solid aerosolgenerating substrate. This may advantageously help to prevent displacement or deformation of the susceptor during transport and handling of the aerosol-generating article.

[0156] The upstream element may comprise a plug of porous material. For example, the upstream element may comprise a cellulose acetate plug.

[0157] The upstream element may have any desired shape. For example, the upstream element may be substantially cylindrical.

[0158] The upstream element may have any desired transverse cross-section. For example, the support element may have a substantially circular, oval or elliptical transverse cross-section.

[0159] The upstream element may have any desired length. For example, the upstream element may have a length of between 1 millimetre and 10 millimetres, between 1 millimetre and 8 millimetres, or between 1 millimetre and 6 millimetres. For example, the upstream element may have a length of between 3 millimetres and 10 millimetres, between 3 millimetres and 8 millimetres, or between 3 millimetres and 6 millimetres. The upstream element may have any desired width. For example, the upstream element may have a width of between 5 millimetres and 10 millimetres, between 6 millimetres and 9 millimetres, or between 7 millimetres and 8 millimetres. The upstream element may have a width that is substantially the same as the width of the aerosol-generating article.

[0160] The aerosol-generating article may comprise a support element located between the solid aerosol-generating substrate and the proximal end of the aerosol-generating article.

[0161] The support element may be located immediately downstream of the solid aerosolgenerating substrate.

[0162] The support element may comprise a hollow tubular segment. For example, the support element may comprise a hollow cellulose acetate tube. The hollow tubular segment may define a longitudinal cavity providing an unrestricted flow channel.

[0163] The support element may have any desired shape. For example, the support element may be substantially cylindrical.

[0164] The support element may have any desired transverse cross-section. For example, the support element may have a substantially circular, oval or elliptical transverse cross-section.

[0165] The support element may have any desired length. For example, the support element may have a length of between 5 millimetres and 15 millimetres, between 5 millimetres and 12 millimetres, or between 5 millimetres and 10 millimetres. For example, the support element may have a length of between 7 millimetres and 15 millimetres, between 7 millimetres and 12 millimetres, or between 7 millimetres and 10 millimetres.

[0166] The support element may have any desired width. For example, the support element may have a width of between 5 millimetres and 10 millimetres, between 6 millimetres and 9 millimetres, or between 7 millimetres and 8 millimetres. The support element may have a width that is substantially the same as the width of the aerosol-generating article.

[0167] The aerosol-generating article may comprise a mouthpiece element located at the proximal end of the aerosol-generating article.

[0168] The mouthpiece element may comprise a plug of porous material. For example, the mouthpiece element may comprise a cellulose acetate plug.

[0169] The mouthpiece element may comprise a mouth end cavity.

[0170] The mouth end cavity may be defined by a hollow tubular element provided at the proximal end of the mouthpiece element.

[0171] The mouth end cavity may be defined by a wrapper.

[0172] The mouthpiece element may have any desired shape. For example, the mouthpiece element may be substantially cylindrical.

[0173] The mouthpiece element may have any desired transverse cross-section. For example, the mouthpiece element may have a substantially circular, oval or elliptical transverse cross-section.

[0174] The mouthpiece may have any desired length. For example, the mouthpiece element may have a length of between 5 millimetres and 20 millimetres, between 5 millimetres and 15 millimetres, or between 5 millimetres and 10 millimetres. For example, the mouthpiece element may have a length of between 6 millimetres and 20 millimetres, between 6 millimetres and 15 millimetres, or between 6 millimetres and 10 millimetres. For example, the mouthpiece element may have a length of between 7 millimetres and 20 millimetres, between 7 millimetres and 15 millimetres, or between 7 millimetres and 10 millimetres.

[0175] The mouthpiece element may have any desired width. For example, the mouthpiece element may have a width of between 5 millimetres and 10 millimetres, between 6 millimetres and 9 millimetres, or between 7 millimetres and 8 millimetres. The mouthpiece element may have a width that is substantially the same as the width of the aerosol-generating article.

[0176] The aerosol-generating article may comprise an aerosol-cooling element located between the solid aerosol-generating substrate and the proximal end of the aerosol-generating article.

[0177] Where the aerosol-generating article comprises a mouthpiece element, the aerosol-cooling element may be located immediately upstream of the mouthpiece element.

[0178] Where the aerosol-generating article comprises a support element, the aerosol-cooling element may be located immediately downstream of the support element. Where the aerosolgenerating article does not comprise a support element, the aerosol-cooling element may be located immediately downstream of the rod of aerosol-generating substrate.

[0179] The aerosol-cooling element may comprise a hollow tubular segment. For example, the aerosol-cooling element may comprise a hollow cellulose acetate tube.

[0180] The hollow tubular segment may define a longitudinal cavity providing an unrestricted flow channel.

[0181] The aerosol-cooling element may have any desired shape. For example, the mouthpiece element may be substantially cylindrical.

[0182] The aerosol-cooling element may have any desired transverse cross-section. For example, the aerosol-cooling element may have a substantially circular, oval or elliptical transverse crosssection.

[0183] The aerosol-cooling element may have any desired length. For example, the aerosolcooling element may have a length of between 5 millimetres and 20 millimetres or between 5 millimetres and 15 millimetres. For example, the aerosol-cooling element may have a length of between 6 millimetres and 20 millimetres or between 6 millimetres and 15 millimetres. For example, the aerosol-cooling element may have a length of between 7 millimetres and 20 millimetres or between 7 millimetres and 15 millimetres.

[0184] The aerosol-cooling element may have any desired width. For example, the aerosol-cooling element may have a width of between 5 millimetres and 10 millimetres, between 6 millimetres and 9 millimetres, or between 7 millimetres and 8 millimetres. The aerosol-cooling element may have a width that is substantially the same as the width of the aerosol-generating article.

[0185] The aerosol-generating article may comprise a ventilation zone located between the rod of aerosol-generating substrate and the proximal end of the aerosol-generating article. Where the aerosol-generating article comprises an aerosol-cooling element, the ventilation zone may be provided at a location along the aerosol-cooling element.

[0186] The ventilation zone typically comprises a plurality of perforations through the peripheral wall of the hollow tubular element. Preferably, the ventilation zone comprises at least one circumferential row of perforations. In some embodiments, the ventilation zone comprises two circumferential rows of perforations. For example, the perforations may be formed online during manufacturing of the aerosol-generating article. Preferably, each circumferential row of perforations comprises from 8 to 30 perforations.

[0187] An aerosol-generating article of the aerosol-generating systems of the present invention preferably has a ventilation level of at least 25 percent.

[0188] The term “ventilation level” is used throughout the present specification to denote a volume ratio between of the airflow admitted into the aerosol-generating article via the ventilation zone (ventilation airflow) and the sum of the aerosol airflow and the ventilation airflow. The greater the ventilation level, the higher the dilution of the aerosol flow delivered to the consumer. The aerosolgenerating article preferably has a ventilation level of at least 20 percent, more preferably at least 25 percent, even more preferably at least 30 percent.

[0189] An aerosol-generating article of the present invention preferably has a ventilation level of up to 60 percent. Preferably, an aerosol-generating article in accordance with the present invention has a ventilation level of less than or equal to 55 percent, more preferably less than or equal to 50 percent.

[0190] For example, an aerosol-generating article of the present invention preferably has a ventilation level from 20 percent to 60 percent, preferably from 25 percent to 55 percent, more preferably from 30 percent to 50 percent, even more preferably about 40 percent.

[0191] Aerosol-generating articles according to the invention may be assembled using known methods and machinery.

[0192] The present invention further provides an aerosol-generating system comprising an aerosol-generating article according to the invention, as described above, and an aerosolgenerating device comprising at least one heater element configured to heat the aerosolgenerating substrate of the aerosol-generating article.

[0193] The aerosol-generating device comprises at least one heater element for heating the aerosol-generating substrate to a temperature sufficient to generate an aerosol from the aerosolgenerating substrate. Preferably, the aerosol-generating device comprises a housing defining a cavity configured to receive the aerosol-generating article, and at least one heater element for heating the aerosol-generating substrate to a temperature sufficient to generate an aerosol from the aerosol-generating substrate when the aerosol-generating article is received within the cavity.

[0194] Preferably, the aerosol-generating device comprises at least one heater element provided at or about the periphery of the heating chamber.

[0195] The aerosol-generating device may be a handheld aerosol-generating device. The aerosol-generating device may be an electrically-operated aerosol-generating device.

[0196] The aerosol-generating device may comprise a power supply and control electronics.

[0197] The aerosol-generating device may comprise a battery and control electronics.

[0198] The aerosol-generating device may be configured to heat the aerosol-generating substrate internally. That is, the aerosol-generating device may be configured to supply heat to the aerosolgenerating substrate from a location internal to the aerosol-generating article.

[0199] For example, in some embodiments the aerosol-generating device comprises a heater element configured to be inserted into the aerosol-generating substrate when the aerosolgenerating article is received within the cavity of the aerosol-generating device.

[0200] In other embodiments, the aerosol-generating article comprises a susceptor element provided at a location within the aerosol-generating substrate, and the aerosol-generating device comprises an inductor coil positioned on or within the housing, a power supply of the aerosolgenerating device being connected to the inductor coil and configured to provide a high frequency oscillating current to the inductor coil.

[0201] The aerosol-generating device may be configured to heat the aerosol-generating substrate externally. That is, the aerosol-generating device may be configured to supply heat to the aerosolgenerating substrate from a location external to the aerosol-generating article. For example, in some embodiments the aerosol-generating device comprises a heater element located about a perimeter of the cavity and configured to heat the aerosol-generating substrate of the aerosolgenerating article from an exterior of the aerosol-generating element of the aerosol-generating article.

[0202] During use, the at least one heater element may be controlled to operate within a defined operating temperature range, below a maximum operating temperature. An operating temperature range between about 150 degrees Celsius and about 300 degrees Celsius in the heating chamber (or device cavity) is preferable. The operating temperature range of the at least one heater element may be between about 150 degrees Celsius and about 250 degrees Celsius.

[0203] Preferably, the at least one heater element is operated to heat the aerosol-generating substrate to a temperature of between about 180 degrees Celsius and about 250 degrees Celsius. More preferably, the at least one heater element is operated to heat the aerosol-generating substrate to a temperature of between about 200 degrees Celsius and about 220 degrees Celsius. The temperature will vary across the duration of smoking but preferably remains within these defined ranges.

[0204] The invention is defined in the claims. However, below there is provided a non-exhaustive list of non-limiting examples. Any one or more of the features of these examples may be combined with any one or more features of another example, embodiment, or aspect described herein.

[0205] EX1. An aerosol-generating article comprising a rod of aerosol-generating substrate, the aerosol-generating substrate comprising at least 50 percent by weight of hemp material on a dry weight basis and one or more aerosol formers applied to the hemp material. EX2. An aerosol-generating article according to example EX1 , wherein the total aerosol former content of the aerosol-generating substrate is less than or equal to 15 percent by weight on a dry weight basis.

[0206] EX3. An aerosol-generating article according to example EX1 or EX2, wherein the aerosol-generating substrate comprises at least 60 percent by weight of hemp material, on a dry weight basis, for example at least 75 percent by weight of hemp material.

[0207] EX4. An aerosol-generating article according to any of the preceding examples, wherein the aerosol-generating substrate comprises less than or equal to 95 percent by weight on a dry weight basis.

[0208] EX5. An aerosol-generating article according to any of the preceding examples, wherein the hemp material comprises shreds of hemp material derived from one or more parts of the hemp plant.

[0209] EX6. An aerosol-generating article according to any of the preceding examples, wherein the hemp material comprises shredded hemp flowers.

[0210] EX7. An aerosol-generating article according to any of the preceding examples, wherein the hemp material comprises cut hemp flowers.

[0211] EX8. An aerosol-generating article according to any of the preceding examples, wherein the hemp material is freeze dried.

[0212] EX9. An aerosol-generating article according to any of the preceding examples, wherein the hemp material has a water content of less than or equal to 15 percent by weight.

[0213] EX10. An aerosol-generating article according to any of the preceding examples, wherein the hemp material has a moisture content of at least 4 percent by weight.

[0214] EX11 . An aerosol-generating article according to any of the preceding examples, wherein the aerosol-generating substrate comprises less than or equal to 10 percent by weight of tobacco material, on a dry weight basis.

[0215] EX12. An aerosol-generating article according to any of the preceding examples, wherein the aerosol-generating substrate is substantially free from tobacco.

[0216] EX13. An aerosol-generating article according to any of the preceding examples, wherein the aerosol-generating substrate comprises additional non-tobacco plant material.

[0217] EX14. An aerosol-generating article according to any of the preceding examples, wherein the aerosol-generating substrate comprises at least 5 percent by weight of cannabidiol (CBD), on a dry weight basis.

[0218] EX15. An aerosol-generating article according to any of the preceding examples, wherein the aerosol-generating substrate comprises less than or equal to 25 percent by weight of cannabidiol (CBD), on a dry weight basis.

[0219] EX16. An aerosol-generating article according to any of the preceding examples, wherein the total cannabidiol (CBD) content of the rod of aerosol-generating substrate is at least 5 milligrams. EX17. An aerosol-generating article according to any of the preceding examples, wherein the total cannabidiol (CBD) content of the rod of aerosol-generating substrate is less than or equal to 20 milligrams.

[0220] EX18. An aerosol-generating article according to any of the preceding examples, wherein the aerosol-generating substrate comprises less than or equal to 0.9 percent by weight of tetrahydrocannabinol (THC).

[0221] EX19. An aerosol-generating article according to any of the preceding examples, wherein the weight ratio of cannabidiol (CBD) to tetrahydrocannabinol (THC) in the aerosol-generating substrate is at least 15.

[0222] EX20. An aerosol-generating article according to example EX19, wherein the weight ratio of cannabidiol (CBD) to tetrahydrocannabinol (THC) in the aerosol-generating substrate is between 20 and 25.

[0223] EX21 . An aerosol-generating article according to any of the preceding examples, wherein the aerosol-generating substrate has a total cannabinoid content of at least 6 percent by weight.

[0224] EX22. An aerosol-generating article according to any of the preceding examples, wherein the one or more aerosol formers comprises glycerol.

[0225] EX23. An aerosol-generating article according to any of the preceding examples, wherein the aerosol-generating substrate has a total aerosol former content of at least 2 percent by weight on a dry weight basis.

[0226] EX24. An aerosol-generating article according to any of the preceding examples, wherein the aerosol-generating substrate comprises one or more flavourants.

[0227] EX25. An aerosol-generating article according to example EX24, wherein the aerosolgenerating substrate comprises between 0.5 percent by weight and 10 percent by weight of flavourant on a dry weight basis.

[0228] EX26. An aerosol-generating article according to any of the preceding examples, wherein the aerosol-generating substrate comprises one or more carboxylic acids.

[0229] EX27. An aerosol-generating article according to any of the preceding examples, wherein the aerosol-generating substrate comprises between 0.5 percent by weight and 3 percent by weight of acid, on a dry weight basis.

[0230] EX28. An aerosol-generating article according to any of the preceding examples, wherein the aerosol-generating substrate comprises one or more binders.

[0231] EX29. An aerosol-generating article according to example EX28, wherein the aerosolgenerating substrate comprises between 0.5 percent by weight and 10 percent by weight of binder, on a dry weight basis.

[0232] EX30. An aerosol-generating article according to any of the preceding examples, wherein the hemp material comprises shredded hemp material.

[0233] EX31 . An aerosol-generating article according to example EX30, wherein the shredded hemp material has a cut width of less than or equal to 6.25 millimetres, for example less than or equal to 5 millimetres, less than or equal to 4 millimetres, less than or equal to 3 millimetres or less than or equal to 2 millimetres.

[0234] EX32 An aerosol-generating article according to any of the preceding examples, wherein the hemp material comprises cut hemp material.

[0235] EX33. An aerosol-generating article according to example EX32, wherein the cut hemp material has a cut width of less than or equal to 6.25 millimetres, for example less than or equal to 5 millimetres, less than or equal to 4 millimetres, less than or equal to 3 millimetres or less than or equal to 2 millimetres.

[0236] EX34. An aerosol-generating article according to any of the preceding examples, wherein the hemp material comprises ground hemp material.

[0237] EX35. An aerosol-generating article according to example EX34, wherein the ground hemp material comprises a plurality of hemp particles having an average particles size of less than 1 millimetre.

[0238] EX36. An aerosol-generating article according to any of the preceding examples, wherein the aerosol-generating substrate has a density of at least 200 milligrams per cubic centimetre.

[0239] EX37. An aerosol-generating article according to any of the preceding examples, wherein the aerosol-generating substrate has a density of less than or equal to 300 milligrams per cubic centimetre.

[0240] EX38. An aerosol-generating article according to any of the preceding examples, wherein the rod of aerosol-generating substrate has a resistance to draw (RTD) of between 50 millimetres H2O and 70 millimetres H2O.

[0241] EX39. An aerosol-generating article according to any of the preceding examples, wherein the rod of aerosol-generating substrate has an RTD of between 4 millimetres H2O and 6 millimetres H2O per millimetre of length.

[0242] EX40. An aerosol-generating article according to any of the preceding examples, wherein upon heating the aerosol-generating substrate in a Tobacco Heating System 6.0 device under the Health Canada machine-smoking regimen, an aerosol is generated comprising at least 30 milligrams of cannabidiol (CBD) per gram of the aerosol-generating substrate.

[0243] EX41 . An aerosol-generating article according to any of the preceding examples, wherein upon heating of the aerosol-generating substrate in a Tobacco Heating System 6.0 device under the Health Canada machine-smoking regimen, the aerosol generated from the aerosol-generating substrate comprises CBD in an average amount of at least 0.15 milligrams per puff.

[0244] EX42. An aerosol-generating article according to any of the preceding examples, wherein upon heating the aerosol-generating substrate in a Tobacco Heating System 6.0 device under the Health Canada machine-smoking regimen, an aerosol is generated comprising cannabidiol (CBD), wherein the amount of cannabidiol (CBD) in the aerosol corresponds to at least 0.25 times the amount of CBD in the aerosol-generating substrate prior to heating. EX43. An aerosol-generating article according to any of the preceding examples, comprising a paper wrapper circumscribing the rod of the aerosol-generating substrate.

[0245] EX44. An aerosol-generating article according to example EX43, wherein the paper wrapper has a thickness of between 30 micrometres and 50 micrometres.

[0246] EX45. An aerosol-generating article according to example EX43 or EX44, wherein the paper wrapper has a grammage of between 20 gsm and 50 gsm.

[0247] EX46. An aerosol-generating article according to any of examples EX43 to EX45, wherein the paper wrapper is hydrophobic.

[0248] EX47. An aerosol-generating article according to example EX46 wherein the paper wrapper comprises polyvinyl alcohol on its inner surface.

[0249] EX48. An aerosol-generating article according to any of the preceding examples, wherein the rod of the aerosol-generating substrate has a length of less than or equal to 15 millimetres.

[0250] EX49. An aerosol-generating article according to any of the preceding examples, further comprising a susceptor element within the aerosol-generating substrate.

[0251] EX50. An aerosol-generating article according to any of the preceding examples, further comprising an upstream section provided upstream of the rod of aerosol-generating substrate, the upstream section comprising at least one upstream element.

[0252] EX51. An aerosol-generating article according to example EX50, wherein the upstream element has a length of between 2 millimetres and 8 millimetres.

[0253] EX52. An aerosol-generating article according to any of the preceding examples, further comprising a downstream section provided downstream of the rod of aerosol-generating substrate, the downstream section comprising at least one hollow tubular element abutting a downstream end of the rod of aerosol-generating substrate.

[0254] EX53. An aerosol-generating article according to example EX52, wherein the downstream section comprises a support element, the support element comprising a hollow tubular element.

[0255] EX54. An aerosol-generating article according to example EX52 or EX53, wherein the downstream section comprises an aerosol-cooling element, the aerosol-cooling element comprising a hollow tubular element.

[0256] EX55. An aerosol-generating article according to any of the preceding examples, further comprising a ventilation zone located between the rod of aerosol-generating substrate and the proximal end of the aerosol-generating article.

[0257] EX56. An aerosol-generating article according to example EX52, wherein the downstream section further comprises a mouthpiece element.

[0258] EX57. A rod of aerosol-generating substrate for use in an aerosol-generating article according to any of the preceding examples, the aerosol-generating substrate comprising hemp material and one or more aerosol formers, wherein the total aerosol former content is less than or equal to 10 percent by weight, on a dry weight basis. EX58. An aerosol-generating system comprising an aerosol-generating article according to any of the examples EX1 to EX56 and an aerosol-generating device comprising at least one heater element configured to heat the aerosol-generating substrate of the aerosol-generating article.

[0259] EX59. An aerosol-generating system according to example EX58, wherein the aerosolgenerating device comprises a housing defining a cavity configured to receive the aerosolgenerating article, and at least one heater element for heating the aerosol-generating substrate to a temperature sufficient to generate an aerosol from the aerosol-generating substrate when the aerosol-generating article is received within the cavity.

[0260] EX60. An aerosol-generating system according to example EX59, wherein the aerosolgenerating device comprises at least one heater element provided at or about the periphery of the heating chamber.

[0261] EX61. An aerosol-generating system according to any of examples EX58 to EX60, wherein the at least one heater element is controlled to operate within an operating temperature range of between 150 degrees Celsius and 250 degrees Celsius.

[0262] Examples will now be further described with reference to the drawings of the accompanying Figures in which:

[0263] Figure 1 is a schematic cross-sectional view of an embodiment of an aerosol generating article according to a first embodiment of the invention; and

[0264] Figure 2 is a schematic cross-sectional view of an embodiment of an aerosol-generating article according to a second embodiment of the invention.

[0265] The aerosol-generating article 1 shown in Figure 1 comprises a rod of aerosol-generating substrate 12, a downstream section 14 located downstream of the rod of aerosol-generating substrate 12 and an upstream section 16 located upstream of the rod of aerosol-generating substrate 12. As shown in Figure 1 , the aerosol-generating article 1 has an upstream end 48 and a downstream end 20. The aerosol-generating article 1 may have an overall length of 45 millimetres and an external diameter of 7.2 millimetres.

[0266] The aerosol-generating article 1 further comprises an elongate susceptor element 44 within the rod 12 of aerosol-generating substrate. In more detail, the susceptor element 44 is arranged substantially longitudinally within the aerosol-generating substrate, such as to be approximately parallel to the longitudinal direction of the rod 12. As shown in the drawing of Figure 1 , the susceptor element 44 is positioned in a radially central position within the rod and extends effectively along the longitudinal axis of the rod 12.

[0267] The susceptor element 44 extends all the way from an upstream end to a downstream end of the rod 12. In effect, the susceptor element 44 has substantially the same length as the rod 12 of aerosol-generating substrate. In the embodiment of Figure 1 , the susceptor element 44 is provided in the form of a strip and has a length of about 12 millimetres, a thickness of about 60 micrometres, and a width of about 4 millimetres.

[0268] The upstream section 16 comprises an upstream element 46 located immediately upstream of the rod 12 of aerosol-generating substrate, the upstream element 46 being in longitudinal alignment with the rod 12. In the embodiment of Figure 1 , the downstream end of the upstream element 46 abuts the upstream end of the rod 12 of aerosol-generating substrate. This advantageously prevents the susceptor element 44 from being dislodged. Further, this ensures that the consumer cannot accidentally contact the heated susceptor element 44 after use.

[0269] The upstream element 46 is in the form of a cylindrical plug of cellulose acetate circumscribed by a stiff wrapper. The upstream element 46 may have a length of 5 millimetres and an external diameter of 7.2 millimetres.

[0270] The downstream section 14 of the aerosol-generating article 1 comprises a support element 22 located immediately downstream of the rod of aerosol-generating substrate 12, an aerosolcooling element 24 located immediately downstream of the support element 22, and a mouthpiece element 42 located immediately downstream of the aerosol-cooling element 24. The support element 22 and the aerosol-cooling element 24 together define an intermediate hollow section 50 of the aerosol-generating article 1.

[0271] The support element 22 comprises a first hollow tubular element 26. The first hollow tubular element 26 is in the form of a hollow cylindrical tube made of cellulose acetate. The first hollow tubular element 26 defines an internal cavity 28 that extends from an upstream end 30 of the first hollow tubular element to a downstream end 32 of the first hollow tubular element 20. The first hollow tubular element 26 may have a length of 8 millimetres and an external diameter of 7.2 millimetres. The first hollow tubular element 26 may have an internal diameter of 3.25 millimetres.

[0272] The aerosol-cooling element 24 comprises a second hollow tubular element 34. The second hollow tubular element 34 is in the form of a hollow cylindrical tube made of cellulose acetate. The second hollow tubular element 34 defines an internal cavity 36 that extends from an upstream end 38 of the second hollow tubular element to a downstream end 40 of the second hollow tubular element 34. The second hollow tubular element 34 may have a length of 8 millimetres and an external diameter of 7.2 millimetres. The second hollow tubular element 34 may have an internal diameter of 5 millimetres.

[0273] As shown by the dashed vertical line in Figure 1 , the aerosol-generating article 1 comprises a ventilation zone 60 provided at a location along the hollow tubular element 34 forming the aerosol-cooling element 24. The ventilation zone may be provided 2 millimetres from the upstream end of the second hollow tubular element 34. A ventilation level of the aerosolgenerating article 1 may be 40 percent. The mouthpiece element 42 is in the form of a cylindrical plug of low-density cellulose acetate. The mouthpiece element 42 may have a length of 125 millimetres and an external diameter of 7.2 millimetres.

[0274] The rod of aerosol-generating substrate 12 may have a length of 12 millimetres and an external diameter of 6.9 millimetres.

[0275] The rod of aerosol-generating substrate 12 comprises a shredded hemp material formed from shredded hemp flowers and glycerol applied to the shredded hemp material. The level of glycerol is approximately 8 percent by weight on a dry weight basis. The cut width of the shredded hemp material is approximately 1 millimetre. The shredded hemp material is circumscribed by a non-porous wrapper (not shown).

[0276] The aerosol-generating article 2 shown in Figure 2 comprises a rod of aerosol-generating substrate 212, a downstream section 214 located downstream of the rod of aerosol-generating substrate 212 and an upstream section 216 located upstream of the rod of aerosol-generating substrate 212. As shown in Figure 2, the aerosol-generating article 2 has an upstream end 248 and a downstream end 220. The aerosol-generating article 2 may have an overall length of 45 millimetres and an external diameter of 7.2 millimetres.

[0277] The upstream section 216 of the aerosol-generating article 2 comprises an upstream element 346 located immediately upstream of the rod of aerosol-generating substrate 212.

[0278] The upstream element 246 is in the form of a cylindrical plug of cellulose acetate circumscribed by a stiff wrapper. The upstream element 246 may have a length of 5 millimetres, an external diameter of 7.2 millimetres and an internal diameter of 5.1 millimetres.

[0279] The downstream section 214 of the aerosol-generating article 2 comprises an aerosolcooling element 224 located immediately downstream of the rod of aerosol-generating substrate 212, and a mouthpiece element 42 located immediately downstream of the aerosol-cooling element 224. The aerosol-cooling element 224 defines an intermediate hollow section 250 of the aerosol-generating article 2.

[0280] The aerosol-cooling element 224 comprises a hollow tubular element 234. The hollow tubular element 234 is in the form of a hollow cylindrical tube made of cardboard. The hollow tubular element 234 defines an internal cavity 236 that extends from an upstream end 238 of the hollow tubular element to a downstream end 240 of the hollow tubular element 234. The hollow tubular element 234 may have a length of 21 millimetres and an external diameter of 7.2 millimetres. The hollow tubular element 234 may have an internal diameter of 6.7 millimetres.

[0281] As shown by the dashed vertical line in Figure 2, the aerosol-generating article 2 comprises a ventilation zone 260 provided at a location along the hollow tubular element 234 forming the aerosol-cooling element 224. A ventilation level of the aerosol-generating article 1 may be 40 percent. The mouthpiece element 242 is in the form of a cylindrical plug of low-density cellulose acetate. The mouthpiece element 242 may have a length of 7 millimetres and an external diameter of 6.9 millimetres.

[0282] The rod of aerosol-generating substrate 212 may have a length of 12 millimetres and an external diameter of 7.2 millimetres.

[0283] The rod of aerosol-generating substrate 212 comprises a shredded hemp material formed from shredded hemp flower and glycerol applied to the shredded hemp material. The level of glycerol is approximately 8 percent by weight on a dry weight basis. The cut width of the shredded hemp material is approximately 1 millimetre. The shredded hemp material is circumscribed by a non-porous wrapper (not shown).

[0284] In use of either of the aerosol-generating articles shown in Figures 1 and 2, a user draws on the mouthpiece element of the aerosol-generating article. When a user draws on the mouthpiece, air is drawn into the aerosol-generating article through the upstream end. The drawn air passes to the rod of aerosol-generating substrate. Heating of the rod of aerosol-generating substrate releases volatile and semi-volatile compounds, which form an aerosol that is entrained in the drawn air as it flows through the rod of aerosol-generating substrate. The aerosol comprises a plurality of cannabinoids from the shredded hemp material, including cannabidiol (CBD). The drawn air and entrained aerosol pass through the intermediate hollow section of the aerosolgenerating article, where they cool and condense. The cooled aerosol then passes through the mouthpiece element of the aerosol-generating article and into the mouth of the user.

[0285] The transfer rate of CBD from the aerosol-generating substrate of the articles shown in Figures 1 and 2 is above 30 percent when the articles are heated in a THS 6.0 device under a Health Canada machine-smoking regimen as described above. This means that the amount of CBD in the aerosol generated from the aerosol-generating substrate is at least 0.3 times the amount of CBD in the aerosol-generating substrate prior to heating. The transfer rate of the CBD from the hemp material into the aerosol is therefore relatively high, demonstrating an efficient aerosolisation of the cannabinoids from the aerosol-generating substrate.

[0286] In addition, a relatively high aerosol volume is maintained across the duration of the 12 puffs such that the level of aerosol that may be delivered to the consumer is relatively consistent across the full duration of heating. A consistent and high flavour and aroma intensity is also provided across the full duration of heating, such that an optimised level of flavour delivery can be provided.

[0287] The specific embodiments and examples described above illustrate, but do not limit, the invention. It is to be understood that other embodiments of the invention may be made and the specific embodiments and examples described herein are not exhaustive.

[0288] For the purpose of the present description and of the appended claims, except where otherwise indicated, all numbers expressing amounts, quantities, percentages, and so forth, are to be understood as being modified in all instances by the term "about". In this context, therefore, a number A is understood as A ± 10% of A. Within this context, a number A may be considered to include numerical values that are within general standard error for the measurement of the property that the number A modifies. The number A, in some instances as used in the appended claims, may deviate by the percentages enumerated above provided that the amount by which A deviates does not materially affect the basic and novel characteristic(s) of the claimed invention. Also, all ranges include the maximum and minimum points disclosed and include any intermediate ranges therein, which may or may not be specifically enumerated herein.

Claims

CLAIMS1. An aerosol-generating article comprising a rod of an aerosol-generating substrate, the aerosol-generating substrate comprising at least 60 percent by weight of hemp material on a dry weight basis and one or more aerosol formers applied to the hemp material, wherein the total aerosol former content is less than or equal to 15 percent by weight on a dry weight basis and wherein the hemp material comprises shreds of hemp material derived from one or more parts of the hemp plant.

2. An aerosol-generating article according to claim 1 , wherein the aerosol-generating substrate is substantially free from tobacco.

3. An aerosol-generating article according to claim 1 or 2, wherein the aerosol-generating substrate has a cannabidiol (CBD) content of at least 5 percent by weight on a dry weight basis.

4. An aerosol-generating article according to any preceding claim, wherein the weight ratio of cannabidiol (CBD) to tetrahydrocannabinol (THC) in the aerosol-generating substrate is at least 20.

5. An aerosol-generating article according to any preceding claim, wherein the hemp material comprises shredded hemp material.

6. An aerosol-generating article according to any preceding claim, wherein the shredded hemp material has a cut width of less than or equal to 2 millimetres.

7. An aerosol-generating article according to any preceding claim, wherein the hemp material comprises cut hemp material.

8. An aerosol-generating article according to claim 7, wherein the cut hemp material has a cut width less than or equal to 2 millimetres.

9. An aerosol-generating article according to any preceding claim, wherein the rod of aerosol-generating substrate has an average bulk density of less than or equal to 300 milligrams per cubic centimetre.

10. An aerosol-generating article according to any preceding claim, wherein the aerosolgenerating substrate has a water content of at least 8 percent by weight on a dry weight basis.

11. An aerosol-generating article according to any preceding claim wherein the hemp material comprises shredded hemp flowers.

12. An aerosol-generating article according to any preceding claim, wherein the rod of aerosol-generating substrate has a resistance to draw (RTD) of at least 40 mm H2O.

13. An aerosol-generating article according to any preceding claim, wherein upon heating the aerosol-generating substrate in a Tobacco Heating System 6.0 device under the Health Canada machine-smoking regimen, an aerosol is generated comprising at least 30 milligrams of cannabidiol (CBD) per gram of the aerosol-generating substrate.

14. An aerosol-generating article according to any preceding claim, wherein upon heating the aerosol-generating substrate in a Tobacco Heating System 6.0 device under the Health Canada machine-smoking regimen, an aerosol is generated comprising cannabidiol (CBD) and wherein the amount of cannabidiol (CBD) in the aerosol corresponds to at least 0.2 times the amount of cannabidiol (CBD) in the aerosol-generating substrate prior to heating.

15. An aerosol-generating article according to any preceding claim, further comprising a downstream section provided downstream of the rod of the aerosol-generating substrate, the downstream section comprising at least one hollow tubular element abutting a downstream end of the rod of aerosol-generating substrate.

16. An aerosol-generating article according to any preceding claim, further comprising an upstream element provided upstream of the rod of aerosol-generating substrate.

17. An aerosol-generating system comprising: an aerosol-generating article according to any one of claims 1 to 16; and an aerosol-generating device comprising: a heating chamber for receiving the aerosol-generating article; and at least one heater element provided at or about the periphery of the heating chamber.

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