iago: It was on CNN (actually I think there was something on it this year even, due to it happening again) then someone who had never smoked in their life got cancer due to second hand smoke. And weed is just that, a weed, it has nothing to do with tobacco.
iago, if you don't beleive cigarettes can kill you, do this, or stop arguing:
Go buy some cigarettes, and smoke the whole pack in that day, if they're so un-lethal, I want YOU to be the one doing the test, this way you'll know you're wrong when you're 6 feet under the ground.