Patent ID: 7827997

Claim:
A cigarette comprising a tobacco rod and a filter element connected to the tobacco rod, said filter element having an end proximal to the tobacco rod and an end distal from the tobacco rod, wherein said filter element comprises: a first longitudinally extending section of filter material proximal to the tobacco rod; a second longitudinally extending section of filter material distal from the tobacco rod and spaced apart from said first section of filter material, the two sections of filter material defining a compartment therebetween; and an adsorbent material contained within at least a portion of said compartment, wherein a plurality of channels extend through said first section of filter material, said channels being defined by walls that extend in a direction parallel to the outer surface of the filter element and adapted for passage of mainstream smoke between said tobacco rod and said compartment, and wherein said first section of filter material has a greater particulate removal efficiency than said second section of filter material.