Filter cigarette

Abstract

A description is given of a filter cigarette, whose filter a) contains fibrous filter material, b) contains an additive with an antimutagenic action on the cigarette smoke in a quantity of less than 15 wt. %, based on the fiber weight of the filter and c) on smoking a similar unventilated filter cigarette, but not containing additive, has a nicotine retention R.sub.N (in %) (determined according to CORESTA recommended method No. 9) satisfying the following formula: R.sub.N .gtoreq.100*(1-D) in which: D=exp(A*B+C), with A=21 mm-filter length (mm) for filter lengths.ltoreq.25 mm or A=-4 mm for filter lengths>25 mm, B=9.3*10.sup.-3 (1/mm) and C=-(d.sup.4 *.DELTA.p*K+L) with d=filter diameter (mm), .DELTA.p=draw resistance of filter (mm hydraulic pressure), K=1.0228*10.sup.-6 (1/(mm.sup.4 *mm hydraulic pressure)) and L=0.2334. Using said filter and measured according to the Ames test with strain TA 98, it is possible to filter mutagenically acting substances with a selectivity of at least 10% better than other smoke ingredients. A particularly suitable method for the manufacture of such a filter cigarette is described.

Dependencies are inferred from the claim text.