Tobacco Smoke Carcinogens Recognized by the International Agency for Research on Cancer Chemical Class No. of Carcinogens Representative Carcinogens Polycyclic aromatic hydrocarbons Benzo[a]pyrene(BaP) (PAH)and their heterocyclic analogs Dibenz a, h]anthracene N-Nitrosamines 8 4-MethyInitrosamino)-1-(3-pyridyl)-1- utanone(NNK N-Nitrosonornicotine(NNN) Aromatic amines 12 4-Aminobiphenyl 2-Naphthy lal Aldehydes 2 Formaldehyde Acetaldehyd Phenols Catechol Caffeic acid Volatile hydrocarbons 3 Benzene 1.3-Butadiene isoprene Other organics Ethylene oxide Acrylonitrile Inorganic compounds Cadmium Polonium-210 Holland-Frei cancer Medicine. 2010Tobacco Smoke Carcinogens Recognized by the International Agency for Research on Cancer Holland-Frei Cancer Medicine, 2010