IMPROVEMENTS RELATING TO SMOKING ARTICLE FILTERS

摘要

The invention describes a filter (1) with a first filter portion (6) comprising an adsorbent, for example carbon, and/or a catalyst, capable of reducing various vapour phase constituents of cigarette smoke. The adsorbent/catalyst is separated from a second filter portion by means of a barrier (2) having pores therein of pore size less than 0.1 ~m. The inventio n also describes a smoking article in which a rod of smoking material, with or without encapsulated flavour, is attached to the above described filter.