Smoking article and mouthpiece therefor

1. A mouthpiece attachable to a rod portion of a smoking article, the mouthpiece comprising an elongate cylindrical element formed from plastic as a hollow tube arranged to be inserted into a corresponding recess of the smoking article rod portion by a user;

wherein the cylindrical element comprises an outer surface having at least one circumferentially extending raised area, and the at least one circumferentially extending raised area is configured to engage with an inner surface of the recess to prevent or restrict air flow between the inner surface of the recess and an outer surface of the mouthpiece, so as to prevent or restrict the ingress of external air into the smoking article between the smoking article rod portion and the mouthpiece,

wherein the at least one circumferentially extending raised area forms a continuous band or ring around the cylindrical element, and

wherein the cylindrical element comprises:

a smoke modifying additive;

adjacent first and second portions each extending partially along the length of the cylindrical element, the first portion being arranged to be inserted into the recess by a user; and

an annular element formed from moulded material arranged around the second portion of the cylindrical element, the annular element having a larger external diameter than the internal diameter of the recess.

2. A mouthpiece according to claim 1 , wherein the internal diameter and/or length of the recess and the external diameter and/or length of the cylindrical element are arranged to substantially correspond such that at least a portion of the cylindrical element can be received within and substantially fill the recess.

3. A mouthpiece according to claim 1 , wherein:

the smoke modifying additive is distributed throughout the cylindrical element and/or annular element;

wherein the smoke modifying additive is contained within at least one frangible capsule;

wherein the smoke modifying additive comprises a botanical additive;

wherein the smoke modifying additive comprises an adsorbent; and/or

wherein the additive is loaded on a thread extending through the cylindrical element and/or annular element.

4. A mouthpiece according to claim 1 , wherein the annular element is attached to the cylindrical element using an adhesive.

5. A mouthpiece according to claim 1 , wherein the cylindrical element comprises a wrapper forming at least part of the outer surface of the cylindrical element.

6. A mouthpiece according to claim 1 , wherein the at least one circumferentially extending raised area is formed as an emboss in an outer surface of the cylindrical element.

7. A mouthpiece according to claim 1 , wherein the cylindrical element comprises a wrapper forming at least part of the outer surface of the cylindrical element, and wherein the at least one circumferentially extending raised area is formed by embossing the wrapper.

8. A mouthpiece according to claim 1 , wherein the body of the cylindrical element comprises fibrous filtration material.

9. A mouthpiece according to claim 1 , wherein the at least one circumferentially extending raised area has a first section with a relatively steep incline as it rises away from the outer surface of the cylindrical element and a second section with a relatively shallow incline as it rises away from the outer surface of the cylindrical element, and wherein the second section is arranged to be forward of the first section as the cylindrical element is inserted into the recess.

10. A smoking article comprising:

a mouthpiece according to claim 1 ; and

the smoking article rod portion having a recess.

11. A method for forming a mouthpiece according to claim 1 , comprising:

forming a wrapping material having the at least one circumferentially extending raised area arranged thereon;

forming an elongate cylinder of filter material; and

wrapping the wrapping material around the elongate cylinder of filter material.