This was always the clincher for me. Cigs and alcohol are far more damaging that weed, at least as far as we know. Without a good way of reporting we really don't know what the long-term effects will be of weed use healthwise, but it is doubtful it will ever even come close to the damage caused by tobacco and alcohol. Too bad those 2 are so deeply ingrained there is no feasible way to ever get rid of them. 1 death by a drunk driver is way way way too many to justify it being legal, imo.
And cigs make everything smell like ****.