Unclear actually. The content of cannabis smoke is quite different from tobacco smoke, and in particular it contains a lot of terpenes, and the cannabinoids th

Unclear actually. The content of cannabis smoke is quite different from tobacco smoke, and in particular it contains a lot of terpenes, and the cannabinoids themselves, which are potent antioxidants. Last I checked, cannabis smoke was implicated in COPD, but doesn't appear to contribute to lung cancer. That was at least a decade ago, however.