Mixed results: The research in this area is mixed. Marijuana smoke contains more carcinogens than tobacco smoke. For instance, some studies show an increase in head & neck cancers in marijuana smokers: http://www.Ncbi.Nlm.Nih.Gov/pubmed/10613339 other studies suggest that smoking only marijuana does not lead to as many respiratory symptoms as smoking tobacco: http://www.Ncbi.Nlm.Nih.Gov/pubmed/19364790.
Answered 5/7/2016
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