We know that smoking tobacco cigarettes is associated with increased mortality, especially due to cardiovascular problems and cancers. compare this situation to what we know (and don't know) about the dangers of marijuana smoke.

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W0lf93
When someone smokes a cigarette, they introduce many harmful substances into their body that have strong links to causing cancer. The difference between that and marijuana is stark because there is little evidence to suggest marijuana has the same effects on the body.