Tongue Neoplasms4-Nitroquinoline-1-oxideTongueMouthTongue DiseasesMouth NeoplasmsTongue, FissuredMouth MucosaMouth DiseasesTongue HabitsPharyngeal NeoplasmsGingival NeoplasmsCarcinoma, Squamous CellNasal CavityOropharyngeal NeoplasmsSalivaNeoplasmsPancreatic NeoplasmsPalatal NeoplasmsDental PlaquePeritoneal CavityHalitosis