Marijuana does not impair your driving.. i dont know where you heard that, ive never had an accadent and ive been high 98% of the time i was driving. Never even came close to an accadent and never got any tickets... People that never done it have no room to say what it does to you or what it doesnt. Also, if packaging factory of marijuana burned down only the people in like a 2 foot radius would be high.... if your sitting in a car with the windows rolled up and theres a blunt being passed around if you dont hit the blunt your not going to get high..