A cigarette

Abstract

The present invention relates to a cigarette, comprising a filter and a tobacco rod. A cavity is provided in the tobacco rod, the cavity running through both ends of the tobacco rod, and the cavity is used to form a smoke delivery channel for smoke to pass from a combustion cone to the filter when the cigarette is burned. In this way, when the cigarette is burned, most of the smoke can flow into the smoke delivery channel and then flow into the filter end through the smoke delivery channel, thereby reducing the retention of nicotine by unburned tobacco and the combustion cone, thereby ensuring a more consistent nicotine delivery effect throughout the entire cigarette during smoking, thereby improving the taste.

Description

Technical Field

[0001] The present invention relates to the field of tobacco, in particular to a cigarette. Background Art

[0002] Currently, conventional cigarettes consist of a filter and a tobacco rod. The tobacco rod is typically wrapped in a layer of cigarette paper. When the cigarette is burned, the tobacco and cigarette paper burn together. With advances in tar reduction and harm reduction technologies, the nicotine and tar content of cigarettes has gradually decreased. Some slim cigarettes have already reduced the nicotine content to as little as 6mg.

[0003] Nicotine affects the taste of cigarettes. The reduction in nicotine content leads to a lower nicotine content in the smoke. When a cigarette burns, the combustion cone formed by the unburned tobacco at the back and the burning part at the front will intercept the nicotine in the smoke. As a result, in the first period of smoking a cigarette, the amount of nicotine delivered to the smoker's body is small, and the taste is lighter, which cannot meet the smoker's needs. In the later period of smoking, the amount of nicotine delivered to the smoker's body gradually increases, and the taste is heavier, which can easily cause irritation to the smoker. The amount of nicotine delivered to the smoker is inconsistent throughout the smoking process of the entire cigarette, affecting the consumer's smoking taste. Summary of the Invention

[0004] The object of the present invention is to provide a cigarette to solve the problem that the nicotine delivery effect of the current cigarette is inconsistent when the cigarette is burned, thereby affecting the taste.

[0005] The technical solution of the cigarette of the present invention is:

[0006] A cigarette comprises a filter and a tobacco rod. A cavity is provided in the tobacco rod and passes through both ends of the tobacco rod. The cavity is used to form a smoke delivery channel for smoke to pass from a combustion cone to the filter when the cigarette is burned.

[0007] Beneficial effects: A cavity is provided in the tobacco rod to form a smoke delivery channel. When the cigarette is burned, most of the smoke can flow into the smoke delivery channel and then flow into the filter end through the smoke delivery channel, reducing the retention of nicotine by unburned tobacco and the burning cone, so that the nicotine delivery effect of the entire cigarette is more consistent during the smoking process, thereby improving the taste.

[0008] Furthermore, the cavity extends in a straight line along the axial direction of the cigarette.

[0009] Beneficial effects: convenient cavity setting, simple manufacturing process, the linearly extended cavity is conducive to smoke flow and improves smoke delivery efficiency.

[0010] Furthermore, the cigarette rod is a double-layer cigarette paper structure, including an inner cigarette paper and an outer cigarette paper. One of the inner space of the inner cigarette paper and the space between the inner cigarette paper and the outer cigarette paper is filled with tobacco, and the other constitutes the cavity.

[0011] Beneficial effect: The cavity is formed by the inner space of the inner layer of cigarette paper in the double-layer cigarette paper structure or the space between the inner and outer layers of cigarette paper, thereby ensuring the stability of the cavity structure and preventing the cavity from being flattened and blocked when pinching the cigarette.

[0012] Furthermore, the tobacco is filled in the internal space of the inner cigarette paper. The inner cigarette paper and the outer cigarette paper are coaxially arranged, and the space between the two is an annular space. The annular space constitutes the cavity, and the gap between the inner cigarette paper and the outer cigarette paper is no more than 1 mm.

[0013] Beneficial effects: Such a structure, while forming a smoke delivery channel, can firmly maintain the cigarette rod formed by the inner layer of cigarette paper filled with tobacco in the outer layer of cigarette paper, without the need to set up other fixing structures, conveniently making a double-layer cigarette paper structure with a cavity, and ensuring the smoke delivery efficiency of the smoke delivery channel; at the same time, the design of the gap between the inner layer of cigarette paper and the outer layer of cigarette paper being no more than 1mm can limit the air that the outer layer of cigarette paper can contact to a certain extent when the cigarette is burning, which is conducive to the synchronous burning of the inner layer of cigarette paper and the outer layer of cigarette paper, and the smaller gap between the two layers of cigarette paper is conducive to forming a negative pressure in the cavity during inhalation, making it easier for smoke to flow into the cavity and be delivered to the filter end.

[0014] Furthermore, the gap between the inner layer of cigarette paper and the outer layer of cigarette paper is 0.5 mm.

[0015] The beneficial effect is more conducive to ensuring that the inner layer of cigarette paper and the outer layer of cigarette paper keep burning synchronously, improving the use effect, and at the same time, balancing the manufacturing difficulty.

[0016] Furthermore, a supporting structure is provided in the annular space.

[0017] Beneficial effect: By adding a supporting structure in the cavity, the structural stability of the double-layer cigarette paper is maintained, ensuring that the smoke delivery channel functions effectively.

[0018] Furthermore, the support structure extends along the axial direction of the tobacco rod, and the support structure includes a plurality of support bodies, each of which is distributed in the circumferential direction of the cigarette around the axis of the tobacco rod.

[0019] Beneficial effects: The support structure extends axially and multiple support bodies are provided circumferentially, which can ensure the reliability of the support.

[0020] Furthermore, the supporting bodies are evenly distributed in the circumferential direction of the cigarette.

[0021] Beneficial effects: Each support body can form a uniform support in the cavity, which is conducive to reliable support; at the same time, the evenly distributed support bodies are also conducive to the uniform flow of smoke in the cavity.

[0022] Furthermore, there are multiple groups of support structures, which are spaced apart in the axial direction of the tobacco rod.

[0023] Beneficial effect: The support structure is arranged in sections, which can improve the smoke delivery efficiency of the smoke delivery channel while ensuring reliable support.

[0024] Furthermore, the supporting structure is formed by cigarette paper with a continuous folding structure, and the cross section formed by adjacent folded edges of the continuous folding structure is triangular, rectangular or arched.

[0025] Beneficial effects: The support structure is formed by the cigarette paper with a continuous folding structure, and the existing corrugated paper manufacturing process can be used to realize the production of the cigarette paper with a continuous folding structure. The process is simple, the technology is mature, and the manufacturing cost of cigarettes will not be increased too much.

[0026] Furthermore, the air permeability of the inner layer of cigarette paper is higher than that of the outer layer of cigarette paper.

[0027] Beneficial effects: The inner layer of cigarette paper adopts cigarette paper with high air permeability, and the outer layer of cigarette paper adopts cigarette paper with low air permeability, so that the air permeability of the inner layer of cigarette paper is better than that of the outer layer of cigarette paper. In this way, when the cigarette is burned, the smoke can more easily pass through the inner layer of cigarette paper into the cavity, and most of the smoke can flow into the smoke delivery channel, and then flow into the filter end through the smoke delivery channel, thereby improving the taste and making it convenient to directly use existing cigarette paper to make cigarettes.

[0028] Furthermore, a ventilation channel is provided on the inner layer of cigarette paper.

[0029] Beneficial effect: by providing ventilation channels on the inner layer of cigarette paper, the air permeability of the inner layer of cigarette paper is improved over that of the outer layer of cigarette paper, and there is no need to deliberately distinguish the types of cigarette paper, which facilitates material selection.

[0030] Furthermore, a plurality of ventilation holes are provided on the inner layer of cigarette paper, and each ventilation hole forms a ventilation channel.

[0031] Beneficial effects: The provision of multiple ventilation holes is beneficial to improving the air permeability of the inner layer of cigarette paper, and at the same time, is beneficial to maintaining the strength of the inner layer of cigarette paper.

[0032] Furthermore, the ventilation holes are circular, square or triangular.

[0033] Beneficial effect: Regularly shaped air holes, easy to process. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic structural diagram of Example 1 of a cigarette of the present invention;

[0035] Figure 2 This is a schematic diagram of the smoke delivery state of a cigarette of the present invention;

[0036] Figure 3 A schematic structural diagram of Example 2 of a cigarette of the present invention

[0037] Figure 4 This is a schematic structural diagram of Example 3 of a cigarette of the present invention.

[0038] In the figure: 1. Outer cigarette paper; 2. Smoke flow direction; 3. Inner cigarette paper; 4. Filter; 5. Tobacco; 6. Burning cone; 7. Support structure; 8. Cavity; 9. Ventilation hole. DETAILED DESCRIPTION

[0039] In order to make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely intended to represent selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0041] It should be noted that the relational terms such as "first" and "second" that may appear in the specific embodiments of the present invention are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof that may appear are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the possible statement "including a..." do not exclude the presence of other identical elements in the process, method, article or device that includes the elements.

[0042] In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0043] In the description of the present invention, unless otherwise expressly specified or limited, the terms "provided with" and "provided with" should be understood broadly. For example, the object "provided with" may be a part of the main body, or may be arranged separately from the main body and connected to the main body. The connection may be detachable or non-detachable. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0044] The present invention is described in further detail below with reference to the examples.

[0045] Example 1 of the cigarette of the present invention:

[0046] like Figure 1 and Figure 2 As shown, the cigarette includes a filter 4 and a tobacco rod, and a cavity 8 is provided in the tobacco rod. The cavity 8 runs through both ends of the tobacco rod. The cavity 8 is used to form a smoke delivery channel for smoke to pass from the combustion cone 6 to the filter 4 when the cigarette is burned.

[0047] Specifically, the cavity extends linearly along the axial direction of the cigarette. The tobacco rod has a double-layered cigarette paper structure, including an inner cigarette paper layer 3 and an outer cigarette paper layer 1. Both the inner cigarette paper layer 3 and the outer cigarette paper layer 1 are cylindrical, with a gap of 0.5 mm between the inner cigarette paper layer 3 and the outer cigarette paper layer 1. The space between the inner cigarette paper layer 3 and the outer cigarette paper layer 1 is an annular space. The annular space between the inner cigarette paper layer 3 and the outer cigarette paper layer 1 forms a cavity 8. There is no tobacco shreds 5 between the inner cigarette paper layer 3 and the outer cigarette paper layer 1. The tobacco shreds 5 fill the internal space of the inner cigarette paper layer 3.

[0048] The outer cigarette paper 1 is bonded to the filter 4, and the inner cigarette paper 3 is wrapped with tobacco 5 and placed inside the outer cigarette paper 1. The outer cigarette paper 1 wraps the inner cigarette paper 3. Since the gap between the inner cigarette paper 3 and the outer cigarette paper 1 is 0.5 mm, the gap is small, and the tobacco rod formed by the inner cigarette paper wrapped with tobacco is light in weight, under the action of the friction between the inner and outer cigarette papers, the tobacco rod formed by the inner cigarette paper 3 wrapped with tobacco is directly placed in the outer cigarette paper 1 and can be maintained in the outer cigarette paper 1 without falling off. At the same time, the small gap can also limit the air that the outer cigarette paper can contact, limiting the burning rate of the outer cigarette paper, which is conducive to ensuring that the inner cigarette paper 3 and the outer cigarette paper 1 burn simultaneously, ensuring normal combustion of the cigarette when smoking. Moreover, the small gap is conducive to forming a negative pressure in the cavity 8 during smoking, making it easier for smoke to flow into the cavity 8 and be delivered to the filter end.

[0049] The inner layer of cigarette paper 3 is made of high-permeability cigarette paper, and the outer layer of cigarette paper 1 is made of low-permeability cigarette paper, which is conducive to the flow of smoke and ensures the efficiency of smoke delivery.

[0050] During production, the tobacco 5 is first wrapped in the inner layer of cigarette paper 3, which is consistent with the production process of tobacco rods in the prior art, and then wrapped with the outer layer of cigarette paper 1. Finally, the filter 4 is bonded to the outer layer of cigarette paper 1 to form a cigarette.

[0051] When a cigarette is burning, the smoke follows the smoke flow direction 2, flows from the position of the front end combustion cone 6 and the rear section filled with tobacco 5, into the cavity 8, and then flows along the smoke delivery channel formed by the cavity 8 to the end of the filter 4 for inhalation. The smoke is generated at the position of the combustion cone 6. Therefore, the smoke mainly flows into the cavity 8 from the position of the combustion cone 6. Since there is a negative pressure at the end of the filter 4 during inhalation, most of the smoke will pass through the tobacco 5 and then pass through the inner layer of cigarette paper 3 into the cavity 8. The tobacco 5 has a greater resistance to the flow of smoke, and the smoke During the flow of the tobacco shreds 5, it will still enter the cavity 8 with smaller flow resistance. In this way, due to the existence of the cavity 8, more smoke flows through the cavity to the filter tip, which can reduce the retention of nicotine by the unburned tobacco shreds 5 and the combustion cone 6. That is, basically the same amount of nicotine is inhaled each time you puff, so that the nicotine delivery effect of the entire cigarette is more consistent during the puffing process, improving the taste. Moreover, during combustion, the cavity 8 between the inner and outer layers is sealed by the combustion cone 6, so that no air can enter, ensuring that the smoke is not significantly diluted by the air, thereby ensuring the taste of the cigarette.

[0052] Example 2 of the cigarette of the present invention:

[0053] The difference between this embodiment and embodiment 1 is that Figure 3As shown, the inner cigarette paper 3 of the cigarette in this embodiment is provided with ventilation holes 9. These holes 9 form ventilation channels, improving the permeability of the inner cigarette paper 3 and facilitating the passage of smoke through the inner cigarette paper into the cavity. In this embodiment, the ventilation holes 9 are circular holes, mechanically punched. Six ventilation holes 9 are provided, evenly distributed along the axial direction of the cigarette and arranged in a straight line. In other embodiments, the number of ventilation holes may be other than six, such as five or seven. The geometric shape of the ventilation holes may also be other than circular, such as square, triangle, pentagon, or hexagon. The geometric shape of the ventilation holes may be regular or irregular. The ventilation holes may not be evenly distributed axially, with varying spacing between the ventilation holes. The ventilation holes may not be arranged in a straight line, such as being arranged in a spiral pattern on the inner cigarette paper. The ventilation holes may also be formed by laser drilling. In this embodiment, the ventilation holes are arranged in a row. In other embodiments, the ventilation holes may be arranged in two or more rows. In other embodiments, the ventilation channel may also be formed by a ventilation slot running through the inner layer of cigarette paper.

[0054] Example 3 of the cigarette of the present invention:

[0055] The difference between this embodiment and embodiment 1 is that Figure 4 As shown, in this embodiment, a support structure 7 is provided in the cavity to maintain the stability of the annular space between the inner cigarette paper 3 and the outer cigarette paper 1, maintain the stability of the double-layer cigarette paper structure, and ensure that the smoke delivery channel functions effectively.

[0056] The support structure 7 extends axially along the tobacco rod and is provided in a group, extending from one end of the cavity to the other, covering the entire axial length of the cavity. A group of support structures 7 includes a plurality of support bodies, each of which is circumferentially distributed on the cigarette around the axis of the tobacco rod. The support structure 7 is formed by cigarette paper with a continuous folding structure. The support structure 7 is generally corrugated and rolled into a tube. The cross-section formed by the adjacent folded edges of the continuous folding structure is triangular. Each two adjacent folded edges together constitute a support body, and each support body is triangular in shape. Each support body is evenly distributed circumferentially around the cigarette. The space enclosed between the support structure 7 and the inner layer of cigarette paper 3 and the outer layer of cigarette paper 1 constitutes a cavity, thereby forming a smoke delivery channel for the flow of smoke. The support structure 7 is formed by cigarette paper with high air permeability, and the air permeability of the cigarette paper of the support structure 7 is higher than that of the inner layer of cigarette paper 3.

[0057] In this embodiment, the cigarettes are manufactured by first forming the supporting structure of the cigarette paper into a continuous folded structure. This folded structure is then bonded to an outer layer of cigarette paper, forming a structure similar to single-faced corrugated cardboard. Shredded tobacco is then wrapped within the inner layer of cigarette paper. The outer layer of cigarette paper, already bonded to the supporting structure, is then wrapped around the inner layer of cigarette paper to produce the cigarette. In other embodiments, conventional double-faced corrugated cardboard manufacturing processes can also be employed, where the supporting structure is pre-laminated with the inner and outer layers of cigarette paper to form a double-layered cigarette paper, which is then directly wrapped with shredded tobacco to produce the cigarette.

[0058] Example 4 of the cigarette of the present invention:

[0059] This embodiment differs from Example 3 in that, whereas in Example 3, a single support structure extends from one end of the cavity to the other, covering the entire axial length of the cavity, this embodiment provides multiple support structures spaced apart in the axial direction of the tobacco rod. In this embodiment, the support structures are spaced evenly apart in sections; in other embodiments, the support structures may be spaced at varying intervals.

[0060] Example 5 of the cigarette of the present invention:

[0061] This embodiment differs from Example 3 in that the support structure in Example 3 is formed from cigarette paper with a continuously folded structure. The adjacent folded edges of the continuous folded structure define a triangular cross-section, with each pair of adjacent folded edges forming a triangular support body. In contrast, the support structure in this embodiment is formed from corrugated cigarette paper rolled into a cylindrical shape, resulting in an arch-like support body. In other embodiments, the support structure is also formed from cigarette paper with a rectangular, toothed cross-section, resulting in a rectangular support body.

[0062] Example 6 of the cigarette of the present invention:

[0063] This embodiment differs from Example 3 in that the gaps between the support structure and the inner and outer layers of cigarette paper in Example 3 form a cavity extending linearly in the axial direction of the tobacco rod. In this embodiment, the support structure is formed by cigarette paper with a continuously folded structure, the fold lines of which extend spirally in the axial direction of the tobacco rod, and the corresponding cavity also extends spirally in the axial direction of the tobacco rod. In other embodiments, the cavity may also extend in a curved shape in the axial direction of the tobacco rod.

[0064] Example 7 of the cigarette of the present invention:

[0065] This embodiment differs from Example 3 in that the support structure in Example 3 is formed from cigarette paper in a continuously folded structure. In this embodiment, the support structure is formed by multiple support bodies spaced apart along the circumference of the cigarette stick. These support bodies are triangular cross-sectional structures folded from cigarette paper and bonded to the inner layer of cigarette paper. In other embodiments, the support bodies may also be cylindrical.

[0066] Example 8 of the cigarette of the present invention:

[0067] The difference between this embodiment and embodiment 3 is that the support structure in embodiment 3 is formed by cigarette paper in a continuously folded structure and surrounds the entire circumference of the inner cigarette paper. In this embodiment, the support structure is also provided on a portion of the entire circumference of the inner cigarette paper.

[0068] Example 9 of the cigarette of the present invention:

[0069] The difference between this embodiment and embodiment 3 is that the support structure in embodiment 3 is formed of high-permeability cigarette paper, while in this embodiment, the support structure is formed of normal-permeability cigarette paper, which has the same permeability as the inner layer of cigarette paper.

[0070] Example 10 of the cigarette of the present invention:

[0071] This embodiment differs from Example 1 in that, whereas in Example 1, the cavity is formed by the space between the inner and outer layers of cigarette paper, with tobacco filling the inner space of the inner layer of cigarette paper, in this embodiment, the cavity is formed by the inner space of the inner layer of cigarette paper, with tobacco filling the space between the inner and outer layers of cigarette paper.

[0072] Example 11 of the cigarette of the present invention:

[0073] This embodiment differs from Example 1 in that the cavity in Example 1 is formed by the annular space between the inner and outer layers of cigarette paper. In this embodiment, the cigarette paper of the tobacco rod comprises two layers of composite cigarette paper: a corrugated inner layer and a cylindrical outer layer. The two layers are bonded together to form a composite paper. Axially extending gaps spaced circumferentially between the inner and outer layers form the smoke delivery channel.

[0074] Example 12 of the cigarette of the present invention:

[0075] This embodiment differs from Example 1 in that, whereas the cavity in Example 1 is formed by the space between the inner and outer layers of cigarette paper, this embodiment includes two or more hollow cigarette paper tubes within the outer layer of cigarette paper. The space within each cigarette paper tube forms a smoke delivery channel, and shredded tobacco fills the space between each cigarette paper tube and the outer layer of cigarette paper.

[0076] Example 13 of the cigarette of the present invention:

[0077] This embodiment differs from Example 1 in that the cavity in Example 1 is formed by the space between the inner and outer layers of cigarette paper, with shredded tobacco filling the inner layer of cigarette paper. In this embodiment, however, the cigarettes are bundled, with multiple cigarette rod units disposed within the outer layer of cigarette paper. Each cigarette rod unit is made of shredded tobacco wrapped in cigarette paper, and the outer layer of cigarette paper wraps the multiple cigarette rod units to form a complete cigarette rod. The cavity is formed by the space between the cigarette paper of each cigarette rod unit and between the cigarette paper of each cigarette rod unit and the outer layer of cigarette paper.

[0078] Example 14 of the cigarette of the present invention:

[0079] This embodiment differs from Example 1 in that the gap between the inner and outer layers of cigarette paper in Example 1 is 0.5 mm. In this embodiment, the gap between the inner and outer layers of cigarette paper is 0.4 mm. In other embodiments, the gap between the inner and outer layers of cigarette paper is 1 mm or 0.6 mm. The gap between the inner and outer layers of cigarette paper can be within a range of no greater than 1 mm.

[0080] Example 15 of the cigarette of the present invention:

[0081] This embodiment differs from Example 1 in that, in Example 1, the tobacco rod formed by wrapping the inner layer of cigarette paper is placed directly inside the outer layer of cigarette paper. In this embodiment, however, the tobacco rod is wrapped with the inner layer of cigarette paper, and both the inner and outer layers of cigarette paper are adhered to the filter tip, first adhering the inner layer of cigarette paper, then adhering the outer layer of cigarette paper, so that the inner and outer layers of cigarette paper are coaxially arranged.

[0082] Example 16 of the cigarette of the present invention:

[0083] This embodiment differs from Example 1 in that the cavity in Example 1 is formed by the annular space between the inner and outer layers of cigarette paper. In this embodiment, the cigarette is wrapped in a single layer of cigarette paper, and the cavity is formed by a hole directly opened in the tobacco within the tobacco rod. During production, a needle coated with glue is inserted into the tobacco within the tobacco rod. Once the tobacco is shaped, the needle is withdrawn, and the hole, thus forming the cavity, is formed.

[0084] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments without inventive effort, or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A cigarette, comprising a filter and a tobacco rod, characterized in that: A cavity is provided in the tobacco rod, and the cavity runs through both ends of the tobacco rod; the tobacco rod has a double-layer cigarette paper structure, including an inner layer of cigarette paper and an outer layer of cigarette paper, and one of the internal space of the inner layer of cigarette paper and the space between the inner layer of cigarette paper and the outer layer of cigarette paper is filled with tobacco, and the other constitutes the cavity; when the cigarette is burned, the resistance of the smoke to the flow in the cavity is less than the resistance of the tobacco to the flow of smoke, and the cavity is used to form a smoke delivery channel for the smoke to pass from the burning cone to the filter tip, and the inner layer of cigarette paper is breathable so that the smoke in the tobacco can pass through the inner layer of cigarette paper into the cavity, and then flow along the smoke delivery channel formed by the cavity to the filter tip for inhalation, so as to reduce the retention of nicotine by unburned tobacco and the burning cone and improve the consistency of the nicotine delivery effect during each puff.

2. The cigarette according to claim 1, wherein: The cavity (8) extends in a straight line along the axial direction of the cigarette.

3. The cigarette according to claim 1 or 2, characterized in that: The tobacco shreds (5) are filled in the internal space of the inner layer of cigarette paper (3). The inner layer of cigarette paper (3) and the outer layer of cigarette paper (1) are coaxially arranged, and the space between the inner layer of cigarette paper (3) and the outer layer of cigarette paper (1) is an annular space. The annular space constitutes the cavity (8). The gap between the inner layer of cigarette paper (3) and the outer layer of cigarette paper (1) is no more than 1 mm.

4. The cigarette according to claim 3, wherein: The gap between the inner layer of cigarette paper (3) and the outer layer of cigarette paper (1) is 0.5 mm.

5. The cigarette according to claim 3, wherein: A supporting structure (7) is provided in the annular space.

6. The cigarette according to claim 5, wherein: The support structure (7) extends along the axial direction of the cigarette rod, and the support structure (7) comprises a plurality of support bodies, each support body being distributed in the circumferential direction of the cigarette stick around the axis of the cigarette rod.

7. The cigarette according to claim 6, characterized in that: The supporting bodies are evenly distributed in the circumferential direction of the cigarette.

8. The cigarette according to claim 5, wherein: There are multiple groups of support structures (7), which are spaced apart in the axial direction of the tobacco rod.

9. The cigarette according to claim 5, wherein: The supporting structure (7) is formed by cigarette paper with a continuous folding structure, and the cross section formed by adjacent folded edges of the continuous folding structure is triangular, rectangular or arched.

10. The cigarette according to claim 1 or 2, characterized in that: The air permeability of the inner layer of cigarette paper (3) is higher than the air permeability of the outer layer of cigarette paper (1).

11. The cigarette according to claim 1 or 2, characterized in that: A ventilation channel is provided on the inner layer of cigarette paper (3).

12. The cigarette according to claim 11, wherein: A plurality of ventilation holes (9) are provided on the inner layer of cigarette paper (3), and each ventilation hole (9) forms a ventilation channel.

13. The cigarette according to claim 12, wherein: The vent hole (9) is circular, square or triangular.

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