Betel-quid and areca-nut chewing and some areca-nut derived nitrosamines.
D000818:Animals; D001114:Areca / Q000633:toxicity*; D002273:Carcinogens / Q000633:toxicity*; D006801:Humans; D009602:Nitrosamines / Q000633:toxicity*
D002273:Carcinogens; D009602:Nitrosamines