Patent ID: 6866045

Claim:
A selective, direct chemical, anti-carcinogenic action filtration method for filtering toxic products, in particular polycyclic aromatic hydrocarbons (PAH) such as benzo(a)pyrene (BaP) and nitrosamines, contained in the tobacco smoke of a tobacco product to control the level of toxic products as compared with that of nicotine in order that the level reduction at the output of the filter is larger than a predetermined threshold, the method comprising steps of: scavenging all or part of the toxic products by means of an active ingredient acting on said toxic products according to molecular processes comparable to those according to which DNA and/or RNA of the human cell react with regards to said toxic products, said active ingredient comprising molecules formed by one or more nitrogen-containing cycles or nitrogen-containing heterocycles in a chain of said molecules, or bound in a common chemical arrangement to one fiber, or both, controlling the operating conditions of the filter by operating in a substantially non-aqueous medium and with a basic pH, and adjusting the mass of the nitrogen-containing cycles or nitrogen-containing heterocycles to be larger than or equal to 0.1% of the mass of the filter.