re: Is smoking really to blame for lung cancer?

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2nd hand smoke is pretty bad as well

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I think you're missing the point. You are regurgitating anti-smoking propaganda.

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Actress Marcia Cross (“Desperate Housewives”) and her doctors revealed Wednesday that they believe her battle with anal cancer was caused by the same human papillomavirus (HPV) that lead to her husband Tom Mahoney’s throat cancer

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here is an example, husband and wife get cancer from HPV and "2nd hand hpv".

If it were lung cancer, they'd blame smoking and 2nd hand smoke. But being anal and throat, they blame hpv, and one bats an eye