Filtered cigarette incorporating an adsorbent material

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 fibrous filter material positioned at the end of the filter element proximal to the tobacco rod;
• a second longitudinally extending section of fibrous filter material positioned at the end of the filter element 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;
• an adsorbent material in granular form contained within said compartment, said adsorbent material being selected from the group consisting of activated carbon, molecular sieves, clays, activated aluminas, silica gels, and mixtures thereof;
• and
• a plurality of ventilation holes adapted for introducing air into the filter element, said ventilation holes being located between the midpoint of said adsorbent-containing compartment and the end of said adsorbent-containing compartment proximal to said first section of filter material,
• wherein said first section of fibrous filter material comprises filaments having a lower weight per unit length than the filaments of said second section of fibrous filter material, said first section of filter material comprising filaments having a weight per unit length of less than about 2.5 denier per filament and said second section of filter material comprising filaments having a weight per unit length of greater than about 3.0 denier per filament.

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 fibrous filter material positioned at the end of the filter element proximal to the tobacco rod;
• a second longitudinally extending section of fibrous filter material positioned at the end of the filter element 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, wherein said first section of filter material has a greater particulate removal efficiency than said second section of filter material, said first section of filter material comprising filaments having a weight per unit length of less than about 2.5 denier per filament and said second section of filter material comprising filaments having a weight per unit length of greater than about 3.0 denier per filament;
• an absorbent material contained within said compartment;
• and
• a plurality of ventilation holes adapted for introducing air into the filter element, said ventilation holes being located at a point along the length of said filter element between the end of the filter element proximal to the tobacco rod and the approximate midpoint of said compartment.

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 fibrous tow filter material positioned at the end of the filter element proximal to the tobacco rod;
• a second longitudinally extending section of fibrous tow filter material positioned at the end of the filter element 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, wherein said first section of filter material has a greater particulate removal efficiency than said second section of filter material;
• an adsorbent material contained within said compartment;
• and
• a plurality of ventilation holes adapted for introducing air into the filter element, said ventilation holes being located at a point along the length of said filter element between the end of the filter element proximal to the tobacco rod and the approximate midpoint of said compartment,
• wherein said first section of filter material comprises filaments having a lower weight per unit length than the filaments of said second section of filter material.