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Very interesting, but doesn't bode as well for the tobacco smokers. Even the researchers were surprised that no increase in cancer was found in the long term marijuana only smokers, but a 19 fold increase for tobacco smokers.
http://patients4medicalmarijuana.wo...info/marijuana-and-your-lungs-recent-studies/
http://patients4medicalmarijuana.wo...info/marijuana-and-your-lungs-recent-studies/