Smoking, alcohol and squamous cell cancers of the oral cavity and gullet.
D000428:Alcohol Drinking; D002294:Carcinoma, Squamous Cell / Q000209:etiology*; D004938:Esophageal Neoplasms / Q000209:etiology*; D006801:Humans; D009062:Mouth Neoplasms / Q000209:etiology*; D012907:Smoking