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This would be a MUCH more convincing link if there were a listing of the various"risks" the non-smokers were involved in. Anyone of these hidden or"intervening" variables could be the cause of the HPV causing(or not causing) cancer.
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So although it is clear that smokeless tobacco contains carcinogens and is not harmless, it is significantly less harmful than smoking cigarettes. I agree with Hecht and colleagues that we should not encourage anyone to use smokeless tobacco, when...
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