Nitrosamine: most are carcinogenic chemical compounds; used in the manufacture of some cosmetics, pesticides, most rubber products, latex; found in beer, fish, meat, cheese preserved with nitrite pickling salt, tobacco smoke
NAB - N-Nitrosoanabasine: ?
NNK - 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone: present in tobacco; potent procarcinogen
NAT - N-Nitrosoanatabine: ?
NNN - N-Nitrosonornicotine: found in tobacco; carcinogen; no adequate studies of human cancer, but sufficient evidence in experimental animals