Dude, Where's My Bong?
A number of states have already approved doctor-prescribed pot, which is to say the camel's nose is well under the tent. This is a lot like gambling industry and how we got table games in Pa. First it was the state lottery, then slots, then craps. It was only a matter of time and taste.
There really is no good reason why pot, ought to remain outlawed when so many other quasi-unhealthy products are perfectly legal and on the market. No doubt, there will be social costs with the decriminalization of pot. The more tolerant we are of drugs, the more use there will be. But decriminalization has its benefits. Instead of wasting time locking people up and burdening our courts with these sorts of cases, we should be treating casual (and even excessive) use as a personal life-style choice to be respected, condemned or made fun of as the community sees fit.
It has always seemed incredibly odd to me that you can have a legal abortion in this country but you can't legally smoke a joint.
In Michigan, medical marijuana is legal. Nolan Findley has some reasonable thoughts on the subject.