Combustion-free cigarette

Abstract

A combustion-free cigarette consisting of a sleeve (1), to the inner casing (1a) of which a nicotine solution is applied, in which it is proposed according to the invention that the sleeve (1) is closed at one of its two ends by a partially air-tight draw-in brake (2) and the nicotine solution consists of a quantity of 0.8-1.2 mg of nicotine dissolved in 75-105 μl of ethanol, the nicotine solution being applied as an at least partial wetting of the inner casing (1a). The cigarette according to the invention reproduces the properties of a conventional cigarette in its dispensing of nicotine by the nicotine being absorbed in a sufficient quantity from the air flow arising within the sleeve (1) during the customary draw-in process and being available for inhaling.

Description

[0001] Combustionless cigarette

[0002] The invention relates to a combustionless cigarette comprising a tube, to the inner casing of which a nicotine solution is applied, according to the preamble of claim 1.

[0003] Conventional cigarettes are based on the combustion of nicotine-containing tobacco contained in a paper tube. This combustion process releases nicotine, which is inhaled by the smoker through suction in what is known as mainstream smoke. Between puffs, the combustion process continues, with nicotine escaping into the environment in what is known as sidestream smoke without being absorbed by the smoker. The desired effect for the smoker is based on the absorbed nicotine, which has an activating effect on cells of the autonomic nervous system. Conventional cigarettes contain approximately 10 mg of nicotine, but due to combustion and the sidestream, only about 1-2 mg of nicotine is inhaled by the smoker during the entire cigarette. This shows that with conventional cigarettes, the majority of the nicotine in the tobacco is not inhaled but burns or escapes.Instead, a multitude of other tobacco ingredients and combustion products are inhaled, which have been proven to have carcinogenic effects, particularly tar, benzene, lead, and cadmium. Nicotine itself, however, is not carcinogenic. While nicotine is considered an addictive substance and can cause dependence, its addictive effect has been proven to be greatly increased by the substances contained in tobacco smoke, such as the monoamine oxidase inhibitors found in tobacco smoke. If the combustion process of tobacco could be eliminated, the addictive potential of nicotine would also be significantly reduced.

[0004] Therefore, attempts were made to develop combustionless cigarettes in which nicotine is applied to carrier bodies of various designs and made available for inhalation without other ingredients of natural tobacco. For example, US Pat. No. 4,800,903 described a porous carrier body made of polyethylene, polypropylene, or similar plastics. As an alternative to porous carrier bodies, carrier bodies made of a solid (non-porous) material were also described.

[0005] US Pat. No. 4,284,089 describes a porous carrier body that is cylindrical in shape and funnel-shaped at both ends. The two funnel-shaped portions are connected by a channel through which the nicotine mixture can flow. The carrier body, which has funnels on both sides, is arranged inside a sleeve.

[0006] US Pat. No. 4,813,437 shows a cigarette-shaped nicotine delivery device in which several sections and several types of cylindrical porous support bodies are arranged. These support bodies are made of plastic and cellulose fibers. Manufacturing with multiple zones and multiple porous support bodies requires multiple work steps, resulting in high manufacturing costs.

[0007] US Pat. No. 6,089,632 describes a cylindrical, porous carrier body designed as a nicotine reservoir. This porous carrier body is soaked with a nicotine solution in a mixing vessel and then dried, thus loading it with nicotine and inserting it into a sleeve. For use, the sleeve with the carrier body must be inserted into a pipe-shaped inhalation device.

[0008] However, it has been shown that open-pored carriers have pores of varying sizes, resulting in a lack of a precisely defined pore surface area of ​​the porous carrier. This is disadvantageous when impregnating the porous carriers with a nicotine solution, as varying amounts of nicotine are always deposited in an open-pored carrier. However, in a combustionless cigarette, the amount of nicotine deposited must be precisely adjustable, as otherwise the consumer could absorb excessive amounts of nicotine that exceed the amount stated on the packaging.

[0009] The aforementioned solutions have also failed to gain market acceptance because their nicotine delivery does not satisfactorily replicate the properties of a conventional cigarette. Storing the required amount of nicotine solution in a tube is not sufficient for market acceptance; the nicotine must also be absorbed in sufficient quantities by the airflow within the tube during the usual intake process and be available for inhalation. Experimental studies on typical smoker behavior show that when consuming a conventional cigarette, at least 10-20 puffs are typically taken, with typical puffs having a volume of approximately 40-80 ml. There are typically 10-40 seconds between puffs on a conventional cigarette. The total consumption time is approximately 10-15 minutes.With typical smoking behavior, nicotine must be released in the usual quantities, i.e., approximately 1 mg, via a combustionless cigarette and made available for inhalation. Under standard conditions, however, nicotine exists as an oily liquid that is low to very low volatility (boiling point 246°C, vapor pressure 0.058 hPa at 20°C, 0.13 hPa at 30°C, and 0.58 hPa at 50°C). Conventional cigarettes without a combustion process do not succeed in transferring the nicotine from its attachment to solid surfaces of carrier bodies and the like into the intake stream sufficiently quickly. However, if typical smoking behavior fails to release the nicotine in the usual quantities via a combustionless cigarette and make it available for inhalation, the desired effect by the smoker is lacking, and acceptance of such a product suffers despite the health benefits due to the absence of carcinogenic substances.

[0010] It is therefore the aim of the invention to provide a combustionless cigarette in which the nicotine can be brought sufficiently quickly from its deposition on solid surfaces into the intake stream so that the effect of nicotine intake of conventional cigarettes by inhalation intended by the smoker can be reproduced in a suitable manner.

[0011] This objective is achieved by the features of claim 1. Claim 1 relates to a combustionless cigarette comprising a tube to whose inner casing a nicotine solution is applied. According to the invention, the tube is closed at one of its two ends with a partially airtight suction brake, and the nicotine solution consists of an amount of 0.8-1.2 mg of nicotine dissolved in 75-105 μl of ethanol, the nicotine solution being applied as an at least partial wetting of the inner casing. The cigarette according to the invention corresponds in its dimensions to conventional cigarettes, as will be explained in more detail below, and in its construction, with the suction brake arranged at one end, also imitates that of a conventional cigarette.Unlike the filter in conventional cigarettes, the intake brake does not serve to filter the drawn-in airflow, but rather to create a flow resistance within the otherwise empty tube, which is intended to mimic the intake resistance of a conventional cigarette, as well as to prevent axial airflow during storage. Of course, the intake brake can also be formed from a conventional cigarette filter, which does not filter nicotine itself.

[0012] According to the invention, the nicotine is applied to the inner casing of the tube as a nicotine solution containing 0.8-1.2 mg of nicotine dissolved in 75-105 μl of ethanol, preferably as a nicotine solution containing 1 mg of nicotine dissolved in 100 μl of ethanol. Nicotine is highly soluble in ethanol. However, the decisive factor for the applicability of such a solution for combustionless cigarettes is the evaporation behavior of the nicotine solution in ethanol, which in turn depends on the relative quantity distribution. As will be explained in more detail below, the applicants were able to demonstrate that a solution according to the invention, when applied with periodic air streams by suction, as corresponds to typical smoking behavior, ensures the release of nicotine from the inner casing into the air stream in accumulated amounts of 250-800 μg within the time period of 10-20 minutes corresponding to typical smoking behavior.The ethanol enables co-evaporation of nicotine with ethanol by mobilizing the otherwise difficult-to-evaporate nicotine into the gas phase.

[0013] The surface quality of the inner shell has also proven crucial for this, as it must ensure at least partial wetting of the inner shell by the nicotine solution, according to the invention. The wettability of a surface by a liquid is characterized by the contact angle (also referred to as the "wetting angle"), which is the angle formed by a liquid droplet on the surface of the solid. The shape that the liquid droplet assumes on a surface depends on the surface tension of the liquid and the nature of the surface. At the boundary between the liquid droplet and the gaseous environment, the surface tension creates a curved contour. At the edge of the liquid droplet, where the contour merges into the solid surface, the contact angle forms between the liquid / solid interface and the tangent to the liquid / gas interface.If the liquid flows evenly over the solid surface, complete wetting with a contact angle of 0° has occurred. If the contact angle is between 0° and 90°, the surface is partially wettable. An angle between 90° and 180° means that the surface is not wettable. The inner casing of the cigarette according to the invention must be partially wettable, i.e. have a contact angle with the wetting liquid of less than 90°. Preferably, the nicotine solution is applied as at least partial wetting of the inner casing with a maximum contact angle of 75°. One possibility for this is to make the sleeve from bagasse. Bagasse is the name given to fibrous residues that arise primarily from the processing of sugar cane and has recently been used as a plastic substitute in the food industry because it can be processed into grease- and water-impermeable packaging.Within the scope of the invention, sleeves can be manufactured by mixing bagasse with water to form a slurry, which is then formed into sleeves and dried. After drying, the outer shell of the sleeves is coated with melamine resins or biodegradable PLA (polylactic acid) to make them water-impermeable. The inner shell of the sleeves exhibits the wettability required by the invention. Furthermore, the sleeves manufactured in this way are biodegradable and can therefore be easily disposed of.

[0014] Another option is to manufacture the sleeve from glass, with the inner shell roughened to ensure a maximum contact angle of 90°. Glass can be reused for the same application, for example, by being collected, cleaned, and sterilized through a deposit system, or it can be reused for another application, for example, by disposing of it in glass collection containers.

[0015] Another cost-effective manufacturing option for the sleeve is to manufacture it from a plastic that can be applied using the FFF (Fused Filament Fabrication) manufacturing process. FFF processes (also known as Fused Deposition Modeling) are additive manufacturing processes ("3D printing") in which a plastic is applied in molten form layer by layer onto a build platform. The plastics used for this purpose are primarily PLA and ABS (acrylonitrile butadiene styrene copolymer), as well as PETG. PETG is a glycol-modified polyethylene terephthalate (PET), which is characterized by its particularly high transparency and low viscosity. These plastics are drawn into a heated nozzle as a plastic wire ("filament") and melted. The molten plastic material is applied and cured automatically layer by layer according to the sleeve geometry to produce a sleeve according to the invention.The polymer sleeves produced in this way have the wettability required by the invention on the inner shell.

[0016] Regarding the casing geometry, it is suggested that the inner casing, at least partially wetted by the nicotine solution, has a surface area of ​​500-2000 mm 2 , preferably a surface of 1000 mm 2 , has. The amount of 75-105 μl of ethanol proposed according to the invention is applied to the inner shell of this surface, as will be explained in more detail below. Regarding the dimensions of the sleeve, it is proposed that the sleeve be cylindrical and have a length of 50-100 mm and an inner diameter of 3-6 mm. The wall thickness of the sleeve is 1.5 mm to 2.5 mm, preferably 1.5 mm, to ensure sufficient strength to prevent the chemicals from diffusing through the wall.

[0017] Furthermore, it is proposed that flavorings be added to the nicotine solution. In the quantities used here, nicotine is a virtually tasteless and odorless substance. The flavorings serve to make the inhaled nicotine solution sensorially perceptible, on the one hand to increase consumption pleasure and, on the other hand, to indicate to the consumer that the nicotine solution in a cigarette has been completely consumed. In contrast to conventional cigarettes, which end quickly through combustion, the cigarette according to the invention remains physically intact apart from the consumption of the applied nicotine solution. Furthermore, the cigarette according to the invention is suitable for nicotine release over a longer period of time than with a conventional cigarette, as will be explained in more detail below, namely for approximately 100 puffs, which, assuming a pause of 10 seconds between each puff, corresponds to a total consumption time of approximately 15 minutes.During these approximately 100 puffs, the entire amount of nicotine solution applied to the inner sleeve, and thus also the flavorings, evaporates. Crucial to this is that the presence of the flavorings does not interfere with the co-evaporation of nicotine with ethanol, which the applicants have been able to demonstrate for a number of flavorings, as will be explained in more detail below.

[0018] Furthermore, it is proposed that the nicotine used for the nicotine solution have a pH in the alkaline range. The pH of cigarette smoke from conventional cigarette tobacco is in the range of 6.3-5.6, i.e., in the acidic range. The nicotine of the nicotine solution, which is preferably proposed within the scope of the invention, with a pH in the alkaline range, is more similar to cigar or pipe tobacco, which is obtained from leaves harvested in the unripe state. The pH of cigar smoke from conventional cigar tobacco is in the range of 8.0-8.6, i.e., in the alkaline range. Free nicotine from such alkaline smoke is readily absorbed through mucous membranes. By using nicotine with a pH in the alkaline range, this effect is utilized and the effect of cigar or pipe tobacco is imitated.

[0019] The invention will be explained in more detail below using exemplary embodiments with the aid of the accompanying figures.

[0020] Fig. 1 is a schematic view of an embodiment of a cigarette according to the invention,

[0021] Fig. 2 experimental results on the cumulative amount of nicotine in μg absorbed by an airflow within a sleeve over the number of simulated puffs, where the sleeve is made of PETG that can be applied using FFF (Fused Filament Fabrication) manufacturing processes,

[0022] Fig. 3 experimental results on the cumulative amount of ethanol (uncalibrated) absorbed by an air stream within a sleeve according to Fig. 2 over the number of simulated puffs, and Fig. 4 experimental results on the cumulative amount of nicotine in pg absorbed by an air stream within a sleeve over the number of simulated puffs, wherein the sleeve is made of glass, the inner shell of which is roughened to ensure a contact angle of maximum 90°.

[0023] First, reference is made to Fig. 1, which shows a schematic view of an embodiment of a cigarette according to the invention. The cigarette according to the invention is similar in size to a conventional tobacco cigarette and has a cylindrical tube 1 with a length of 50-100 mm and an inner diameter of 3-6 mm. The inner casing 1a of the tube 1 has a surface area of ​​500-2000 mm 2 , preferably a surface of 1000 mm2 The outer shell 1b of the sleeve 1 can be colored with food-safe ink, for example, to give the sleeve 1 a white color. The wall thickness of the sleeve 1 is 1.5 mm to 2.5 mm, preferably 1.5 mm, to ensure sufficient strength to prevent the chemicals from diffusing through the wall.

[0024] At its first end, the sleeve 1 is closed with a partially airtight intake brake 2, which is designed, for example, as a conventional cigarette filter. The intake brake 2 represents an intake resistance that reduces the air flow speed within the sleeve 1, so that the contact time between the air flow and the inner casing 1a is increased. In addition, the smoker is offered the usual intake resistance. The sucked-in air reaches the interior of the sleeve 1 via the opening at the opposite, second end of the sleeve 1, draws in an axial direction through the interior of the sleeve 1 towards the intake brake 2 and through the intake brake 2 until it leaves the cigarette according to the invention at the free end of the intake brake.Alternatively, the intake brake 2 can also be designed as a solid, cylindrical intake plug with a conical channel made of biodegradable plastic, which has a conical air channel inside that tapers towards the intake opening and is open at both ends. The open, second end of the cigarette according to the invention can be sealed with a sealing film to prevent the nicotine solution from escaping during storage. Such a sealing film would have to be removed before use. However, the applicants have determined that the second, open end of the cigarette can also be omitted because the escape of evaporated nicotine solution is negligible under the given geometric conditions, especially when cigarettes according to the invention are stored sealed in an airtight package.Obviously, the air exchange between the sleeve 1, which is closed on one side, and the environment is sufficiently low so that saturation of evaporated nicotine solution quickly occurs within the sleeve 1, which prevents further evaporation of the nicotine solution.

[0025] A quantity of 15-105 μl of ethanol, mixed with a quantity of 0.8-1.2 mg of nicotine, is applied to the surface of the inner casing 1a. The nicotine solution can be applied to the inner casing 1a using a dosing and spraying needle, for example, which has a plurality of holes or nozzles along its axial length. With such a dosing and spraying needle, it is possible to wet the entire inner casing 1a of the sleeve 1 with the nicotine solution in one spray.

[0026] The following studies demonstrated sufficient mobilization and entrainment of the applied nicotine by a periodic airflow, as corresponds to typical smoking behavior.

[0027] Experimental evidence:

[0028] First, the co-vaporization of nicotine and ethanol was demonstrated and quantified using a nicotine solution of 1 mg nicotine in 100 μl ethanol. The evaporation was to occur in a process that corresponded to typical smoking behavior. For this purpose, a smoker was asked to suck on a tube connected to a measuring cylinder, just as they would suck on a cigarette. This experiment was repeated with a female smoker. Both subjects repeated the process at least five times. It was found that typical puffs taken by these subjects had volumes of approximately 40–80 ml. Questioning the subjects revealed that they had a pause of approximately 10–40 seconds between puffs on a normal cigarette.

[0029] In order to reproducibly replicate this smoking behavior for laboratory tests, a measurement setup was developed in which air was cyclically drawn through a tube whose dimensions corresponded to a cigarette according to the invention and whose inner jacket 1a was moistened with a 100 μl ethanol-nicotine mixture with 1 mg / 100 μl nicotine. The "exhalation" did not occur through the tube. These tubes, filled with a nicotine-ethanol mixture, are referred to below as evaporator tubes. In an initial experiment, the evaporator tubes were manufactured from PETG using an FFF (Fused Filament Fabrication) manufacturing process. These evaporator tubes were manufactured using a commercially available "Ultimaker 2+" 3D printer with a 0.25 mm needle tip. The layer thickness of the applied plastic layers was between 60 and 150 μm.

[0030] The measurement setup also allowed for a variable time interval between puffs to be programmed as a pause using a microcontroller controlling the setup. Suction was performed via two 50 ml syringes connected in parallel, driven by a linear motor. A switching valve allowed air to be drawn from the evaporator tube through an adsorber tube (Tenax tube), an alcohol sensor, and a UV sensor. The switching valve shut off the path through the tubes and allowed the syringes to be emptied into the ambient air.

[0031] The adsorbent tubes were filled with Tenax. Tenax is the brand name of poly(2,6-diphenyl-p-phenylene oxide), a polymeric adsorbent resin used as a column packing material for gas chromatography because substances such as nicotine adsorb almost completely to the resin when the amount of substance is significantly below the binding capacity. By heating, the substances can be desorbed and then fed in the gas phase to a mass spectrometer for further analysis. The Tenax tubes (17.8 cm) were analyzed using a "Gerstel TDS 3" with a "TDS A2" autosampler, typically operating at a split of 20:1 or 5:1. The molecules to be analyzed are transferred to the gas phase (desorption) and ionized by heating in an inert gas atmosphere at low pressure. The ions are then accelerated by an electric field and fed to an analyzer, which separates them according to their mass-to-charge ratio m / z.The molecules can become fragmented, which can lead to different peaks in the spectrogram.

[0032] The resulting chromatograms showed clear nicotine peaks, quantified by the nicotine-typical m / z ratio at 133 and 162. No influences from methanol or traces of other organic compounds were detected in the corresponding m / z ranges. A total of 30 intakes were performed, and the air drawn from puffs 1-3, 3-5, 5-10, 10-20, and 20-30 were collected and analyzed chromatographically.

[0033] Since the integral area under the curve of a peak is a measure of the substance quantity, the peaks were integrated for further analysis, thus determining the areas. For calibration, glass tubes were filled with known amounts of nicotine and also measured using thermal desorption. The actual substance quantity could be estimated from the ratios of the peak areas of the calibration measurements to the areas of the actual experiments.

[0034] The tests showed that approximately 20 μg of nicotine was released after 30 puffs. It can be seen over time that the curve of the cumulative nicotine amount continues to rise after 30 puffs. Therefore, further tests were conducted with larger numbers of puffs. Furthermore, the evaporated alcohol amount was quantified using the integrated alcohol sensor, although no absolute measurement was taken. However, since a known amount of 100 μl was used, exact quantification is not necessary. Fig. 2 shows the measured curve of the cumulative nicotine amount, and Fig. 3 shows the measured curve of the cumulative alcohol amount. The alcohol amount was only given in arbitrary units (au), since, as mentioned, no exact calibration was performed.

[0035] In the measurements described, a pause time of 10s was programmed between the individual moves, so that 60 moves were performed in 10 minutes.

[0036] As can be seen in Figure 2, nicotine was delivered over 150 puffs, with the delivery appearing to follow a biphasic (sigmoid) curve. As can be seen in Figure 3, alcohol was also delivered in a sigmoid pattern, but significantly faster. Nicotine delivery is evidently concentration-dependent. The total amount of nicotine delivered during this time is approximately 75% of the input amount.

[0037] As mentioned, these measurements were performed using 3D-printed polymer tubes as evaporation tubes, which had a relatively porous wall structure. Since it is assumed that the porous wall structure delayed evaporation due to capillary effects and the resulting reduced exposed surface, the tests were repeated using roughened glass tubes. For this purpose, commercially available Pasteur pipettes were cut to length using a glass cutter and ground using a grinding attachment on a Dremel. This roughness reduced the contact angle to below 90° and thus spread the nicotine-ethanol mixture in the glass tube. This resulted in the complete release of ethanol and nicotine after just 80 puffs, i.e., approximately 14 minutes, as can be seen in Fig. 4.

[0038] The results presented here fit well with previous studies conducted by the applicants, in which the residual amounts of nicotine were determined in tubes in which an alcohol-nicotine solution was vaporized. These studies showed that only very small residual amounts were detectable. Finally, the influence of flavorings on the co-evaporation of nicotine with ethanol was investigated. For this purpose, the following flavorings were added to the nicotine-ethanol mixture in different test series: "Smoke Flavor" (Product No.: 01400238), "Chocolate Flavor" (Product No.: 01602888), "Tea Flavor" (Product No.: 628 / 19A), "Coffee Flavor" (Product No.: 01602932), and "Akrastevia XI" (Product No.: 86600108). 10p! of each of these solutions were used. and this mixture was diluted with ethanol until only a weak (tolerable) sensory impression could be subjectively detected.100 μl of this mixture was added to an evaporator tube along with 100 μl of the nicotine-ethanol solution, ensuring that these solutions did not mix. The apparatus was then subjected to 150 puffs, and the adsorbent tubes were subsequently eluted with methanol. As a control, the experiment was also performed without flavorings. The methanol eluates were then applied to an Alox-RP18 thin-layer chromatography plate (Alugram-RP18). After drying, a capillary force-driven run was performed using methanol as the eluent. The nicotine bands visible under UV illumination did not differ visibly between the samples containing flavorings and those without. This procedure was chosen because the flavorings were not precisely specified and quantified, and contamination of the thermal desorption system was to be avoided.

[0039] Nicotine-ethanol evaporation measurements were repeated at least three times with the 3D-printed evaporation tubes and showed consistent results. Measurements with reduced evaporation time using roughened glass surfaces and those with flavorings were each performed twice and also showed consistent results.

[0040] These experimental studies demonstrate that through intermittent, pulsed aeration of a tube containing a nicotine-ethanol solution at 1 mg / 100 μl, significant amounts of nicotine can be transferred into the gas phase and transported away. Using a 3D-printed porous plastic tube as a carrier, approximately 750 μg of nicotine (1 mg was applied) was released over 30 minutes. This co-evaporation of ethanol and nicotine was not noticeably influenced by flavorings. By appropriately selecting the surface of the evaporation tube, the rate of evaporation can be influenced to a certain extent. In the present case, with a roughened glass tube, nicotine could be released over a period of approximately 15 minutes at an inhalation frequency of one "puff" per 10 seconds, whereby approximately 70% of the originally applied nicotine could be detected in the gas phase.

[0041] Thus, the applicants were able to demonstrate that a solution according to the invention, when applying periodic air flows by suction, as corresponds to typical smoking behavior, ensures the release of nicotine from the adhesion to the inner casing 1a into the air flow in accumulated amounts of 250-800 μg within the times of 10-20 minutes corresponding to typical smoking behavior. The cigarette according to the invention thus reproduces the properties of a conventional cigarette in its nicotine release in that the nicotine is absorbed in sufficient quantity by the air flow established within the casing 1 during the usual suction process and is available for inhalation. The ethanol enables co-evaporation of nicotine with ethanol, as ethanol mobilizes the otherwise difficult-to-evaporate nicotine into the gas phase.The cigarette according to the invention can also be consumed without restrictions, for example in cafes, bars or restaurants, but also in train stations or airplanes, and is compliant with non-smoking laws, as it does not emit harmful tobacco combustion smoke, nor any form of smoldering as with tobacco heaters or vapor as with e-cigarettes or e-shishas.

Claims

Patent claims:

1. Combustionless cigarette consisting of a sleeve (1) on whose inner jacket (1a) a nicotine solution is applied, characterized in that the sleeve (1) is closed at one of its two ends with a partially airtight intake brake (2) and the nicotine solution consists of an amount of 0.8-1.2 mg nicotine dissolved in 75-105 μl ethanol, wherein the nicotine solution is applied as an at least partial wetting of the inner jacket (1a).

2. Combustionless cigarette according to claim 1, characterized in that the nicotine solution consists of an amount of 1 mg of nicotine dissolved in 100 pl of ethanol.

3. Combustion-free cigarette according to claim 1 or 2, characterized in that the nicotine solution is applied as an at least partial wetting of the inner sheath (1a) with a contact angle of maximum 75°.

4. Combustion-free cigarette according to one of claims 1 to 3, characterized in that the sleeve (1) is made of bagasse.

5. Combustion-free cigarette according to one of claims 1 to 3, characterized in that the sleeve (1) is made of glass, wherein the inner lining (1a) is roughened to ensure a contact angle of a maximum of 90°.

6. Combustion-free cigarette according to one of claims 1 to 3, characterized in that the sleeve (1) is made of a plastic that can be applied using FFF (Fused Filament Fabrication) manufacturing processes.

7. Combustion-free cigarette according to one of claims 1 to 6, characterized in that the inner sheath (1a) at least partially wetted by the nicotine solution has a surface area of ​​500-2000 mm² 2 exhibits. 8 Combustion-free cigarette according to claim 7, characterized in that the inner sheath (1a) at least partially wetted by the nicotine solution has a surface area of ​​1000 mm² 2 9. Combustion-free cigarette according to any one of claims 1 to 8, characterized in that the sleeve (1) is cylindrical and has a length of 50-100 mm and an inner diameter of 3-6 mm.

10. Combustion-free cigarette according to any one of claims 1 to 9, characterized in that flavorings are added to the nicotine solution.

11. Combustion-free cigarette according to any one of claims 1 to 10, characterized in that the nicotine used for the nicotine solution has a pH value in the alkaline range.

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