ANSWERS: 5
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On very rare occasions, yes. But if you want to get mouth ulcers, I'd recommend chewing tobacco. +5
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It causes cancer, which is why people lose their tongues. I don't see why it can't cause ulcers! :)
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It can cause ulcers and then it may cause cancer by allowing the carcinogens in the smoke to penetrate the skin. Mucous membranes are more susceptible. ( I am an ex smoker. 30 a day)
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Sure: http://www.thedailystar.net/newDesign/news-details.php?nid=74674
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