title: Smokeless tobacco: a risk factor in oral cancer.
mesh_terms: D000368:Aged; D000818:Animals; D002291:Carcinoma, Papillary / Q000139:chemically induced; D005260:Female; D006168:Guinea Pigs; D006801:Humans; D008297:Male; D051379:Mice; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000139:chemically induced* / Q000473:pathology; D009602:Nitrosamines / Q000633:toxicity; D051381:Rats; D014030:Tobacco, Smokeless
chemical_list: D009602:Nitrosamines; C008655:N'-nitrosonornicotine