Stats? I have never heard about anyone stoned on Pot all by itself, not mixed with anything else, that flipped out and killed someone. Show me where someone that used only pot killed some one with a car. It is said that Pot is harsher on the lungs then cigaretts because of how it is smoked, but there is no evidence that it destroys all internal organs or brain cells. As a matter a fact in the last couple of years science has shown that there is evidence that it may heal brain injuries as well as other ailments.
So I restate, Alcohol is more dangerous then Pot.