Cigarette with adsorbent at tip end thereof
A zone or plug of porous adsorbent material, primarily activated carbon, is placed in the tobacco rod of a cigarette a short distance from the lighting end thereof. The amount of activated carbon is sufficient for effective removal of volatile smoke constituents while allowing the cigarette to burn continuously. The activated carbon traps volatile smoke constituents in close proximity to the burning coal in the first puffs of the cigarette. As the cigarette continues to burn, the burning coal consumes the activated carbon. The adsorbed smoke constituents are effectively removed without releasing them back into the mainstream smoke. Following the consumption of the activated carbon in the tobacco rod, the cigarette is unchanged from a cigarette of conventional design.
1. A cigarette consisting essentially of a tobacco rod and an adjoining filter, and at least one zone or plug of porous adsorbent material in the tobacco rod at a lighting end thereof spaced inwardly therefrom, and wherein the zone or plug of adsorbent material is spaced 4 to 8 mm from the lighting end of the cigarette.
2. A cigarette as in claim 1 wherein the porous adsorbent material is activated carbon.
3. A cigarette as in claim 1 wherein the zone or plug of porous adsorbent material comprises about 20 to 50 mg of activated carbon.
4. A cigarette comprising a tobacco rod and an adjoining filter, and including a plurality of spaced apart zones or plugs of porous adsorbent material in the tobacco rod at a lighting end thereof spaced inwardly therefrom, and wherein the zone or plug of porous adsorbent material closest to the lighting end is spaced 4 to 8 mm from the lighting end of the cigarette.
5. A cigarette as in claim 4 wherein the porous adsorbent material of each zone or plug comprises activated carbon.
6. A cigarette as in claim 4 wherein each zone or plug of porous adsorbent material comprises 20 to 50 mg of activated carbon.
7. A cigarette comprising a tobacco rod and an adjoining filter, a plurality of spaced apart zones or plugs of porous adsorbent material in the tobacco rod at a lighting end thereof spaced inward by therefrom, and wherein the zones or plugs of adsorbent material are spaced apart 4 to 8 mm, and wherein the zone or plug of adsorbent material closest to the lighting end of the cigarette is spaced 4 to 8 mm therefrom.
8. A cigarette as in claim 7 wherein the porous adsorbent material is activated carbon.
9. A cigarette as in claim 7 wherein the zones or plugs of porous adsorbent material each comprise about 20 to 50 mg of activated carbon.