While there are harmful effects of smoking weed, and like Mcleanhatch pointed out, one must be aware of the consequences of getting high (i.e. risks of traffic accidents, etc), the fact remains that marijuana as a substance is not deadly. Which, when you think about it, is pretty rare. Every other chemical that we are exposed to in mainstream society (alcohol, nicotine, aspirin, tylenol, etc) have a fairly low toxicity level and if not used moderately, are very dangerous if not deadly. I can understand Mcleanhatch's reluctance to have intoxicated drivers on the road with him, but we must also keep in mind that people that are tired or angry are just as likely to get into a car wreck as someone who is intoxicated.