Smoke for smoke, cannabis and tobacco are probably equally harmful. It's the combustion of plant matter and the inhalation of smoke, not the nicotine per se, th

Smoke for smoke, cannabis and tobacco are probably equally harmful. It's the combustion of plant matter and the inhalation of smoke, not the nicotine per se, that makes tobacco so harmful. The same applies for smoked cannabis, and indeed, some studies have found cannabis smoke slightly more harmful in that regard, in so far as cannabis isn't usually smoked with a filter. But unlike tobacco, cannabis does not contain a chemical as highly addictive as nicotine. Your average tobacco smoker probably smokes an order of magnitude more tobacco than your average cannabis smoker smokes cannabis. Evidently there is a nonzero risk of physical or psychological dependency for marijuana, but it's nowhere near the risk profile of tobacco.