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The co-relation is to the amount of tar produced. Not lung cancer. These studies are never accurate any ways because they have a hard time finding people who only smoke weed, most smoke cigarettes as well. Also marijuana doesn't have a lot of chemicals added during production that tabacco has. Its no miracle, smoke anything enough and you'll probably get lung cancer.
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you don't know you're wearing a leash if you sit by the peg all day..
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