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Benzo-a-pyrene is one of the most potent, and notably was the first chemical carcinogen to be isolated

This change happens because tobacco reduces blood flow to the tissues in your mouth

Whether simply to prolong the social activity of smoking a joint or to save money by extending the duration of a smoking session, this argument seems to be the hardest to rebut, but its really not

When we look at the signatures from the marijuana smokers, they look closer to non-users and non-smokers than the tobacco smokers, and that was a surprise to us. These findings diverge from earlier cell culture studies, which showed that both tobacco and marijuana smoke generate significant oxidative stress and inflammation