Smokeless tobacco and some tobacco-specific N-nitrosamines.
D000818:Animals; D002273:Carcinogens; D006224:Cricetinae; D014943:Global Health; D006801:Humans; D051379:Mice; D009369:Neoplasms / Q000209:etiology; D009538:Nicotine / Q000633:toxicity; D009602:Nitrosamines / Q000633:toxicity*; D051381:Rats; D014030:Tobacco, Smokeless / Q000737:chemistry / Q000633:toxicity*
D002273:Carcinogens; D009602:Nitrosamines; D009538:Nicotine