I hate people that say marijuana smoke is 20 times more harmful than tobacco smoke?

Marijuana smoke can cause cancer, but not that directly. Marijuana smoke is full of carcinogens, but your body naturally expels it from your lungs. You just hack it up. However, lots of marijuana smokers also smoke cigarettes. Cigarette smoke destroys the cilia in your lungs, the stuff moving crap out of your body. When you combine cigarette and marijuana smoking, not only are you getting the carcinogens from cigarette smoke, but from the pot as well.