Like tobacco smoke, marijuana smoke contains cancer-causing chemicals. There are 33 cancer-causing chemicals contained in marijuana. Marijuana smoke also deposits tar into the lungs. In fact, when equal amounts of marijuana and tobacco are smoked, marijuana deposits four times as much tar into the lungs. This is because marijuana joints are un-filtered and often more deeply inhaled than cigarettes.
Although it may be true that marijuana smoke deposits more tar into the lungs than tobacco smoke, current evidence does not indicate that the former results in proportionally greater deleterious health affects.
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