juggernaut, what you state as fact is complete and utter horseshit. There is plenty of medical evidence that nonsmokers have died of cancer(s) caused from second hand smoke. It also causes low birth weight, asthma and a multitude of inner hear disorders in children. It's science. Your addiction is causing you to lose sight of the truth. Get help.
Marijuana on the other hand, if left in its natural state (nothing added) is typically quite safe. Inhaling any smoke, whether it be pot or a bon fire, is not healthy. But the smoke produced by pot isn't any more harmful than burning wood. It just stinks really bad.
I'm one of those few strange individuals who has never even tried pot, but I could care less if others do and I think it would be beneficial, from a law enforcement standpoint, for it to be legalized. I know it sure would make my brother happy.
