Quote:
Originally Posted by anticipation
They're actually just completing a study on this exact subject; so far, the combined use of marijuana and tobacco is almost twice as harmful than the use of just tobacco, but strangely marijuana smoke on its own has shown to be not as dangerous as tobacco smoke.
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I'd guess that the marijuana smoke just exacerbates the more negative effects of cigarette smoke. Marijuana smoke's not harmless by any means, but I guess in this case it's like catching something on fire with gasoline and then throwing pine needles on it.