First, why is the legality being questioned here, in the Theology Sub-forum? I have never questioned the morality of smoking, sure it hurts your body, but so does a majority of human consumption & activity.
Second, as a smoker, I still cannot believe that cannabis is considered a gateway drug. A majority of the crime & pain associated with cannabis is in the current system of acquiring buds (the smokable part of the plant). I grow my own to avoid giving a single penny to someone that sells other, more often than not, illegal, and to my knowledge & experience, significantly more dangerous substances. The danger is not the drug, it’s how it is being distributed.
Third, the current stereotype of a ‘stoner’ is a lethargic, unproductive, & apathetic citizen. I make certain I never give off this aura, and I really do not get along well with people that embrace this lifestyle. It is also the government’s fault, during the Clinton administration an amendment to the Federal Funding Act was made, ensuring that no person, even minors, would be allowed federal funding to attend college, if they had a possession charge. Although recently defeated (September 17, 2009 the renewal for the Amendment was shot down

), society needs to learn that ‘stoners’ are no different than ‘fags’, a discriminatory generalization.
Of course, the general rules still hold, driving while under the influence of THC should be treated no differently than alcohol, although I firmly believe that the penalty should be increased anyway, this extends to all the implied rules that are already in place for legal intoxicants.
Smoke more, chill out.