Cigarette

1. A cigarette comprising:

a tobacco rod;

a supporting segment positioned at a downstream end of the tobacco rod;

a cooling segment positioned at a downstream end of the supporting segment; and

a mouthpiece positioned at a downstream end of the cooling segment,

wherein the cooling segment includes a plurality of air channels formed along a longitudinal direction of the cigarette, and porosity of the cooling segment is less than 50%,

wherein the cooling segment includes a bundle of fibers arranged along the longitudinal direction of the cigarette, thereby forming the plurality of air channels, and

wherein the bundle of fibers comprises at least one sub-bundle of fibers which include straight fibers of a polymer material arranged along the longitudinal direction of the cigarette; or

the bundle of fibers comprises at least one sub-bundle of fibers which include crimped fibers of a polymer material arranged along the longitudinal direction of the cigarette; or

the bundle of fibers is comprised of fibers made of a polymer material and includes at least one sub-bundle of straight fibers arranged along the longitudinal direction and at least one sub-bundle of crimped fibers arranged along the longitudinal direction.

2. The cigarette of claim 1 , wherein the cooling segment is wrapped by a wrapper having a basis weight of 60 g/m 2 or more.

3. The cigarette of claim 1 , wherein the cooling segment is made through a extrusion method or a textile weaving method.

4. The cigarette of claim 1 , wherein the cooling segment is coated with a flavoring liquid.

5. The cigarette of claim 1 , wherein the crimped fibers are crimped at a constant interval or at an irregular interval.

6. The cigarette of claim 1 , wherein a length of the cooling segment is 5 mm to 30 mm.

7. The cigarette of claim 1 , wherein the tobacco rod is made of sheet, strands or tobacco fragments obtained by finely cutting a tobacco sheet.