U.S. Patent 6,273,095. Disclosed herein is a filter for use with tobacco products, such as cigarettes, cigars and pipes, which selectively absorbs toxic compounds and carcinogenic polynuclear aromatic compounds passing through it, but which permits most low molecular weight species, and in particular nicotine, to pass through. The filter is made from a middle-density polyurethane foam which is pre-treated to increase the number of binding sites for polynuclear aromatic compounds.