Mark Kleiman thinks that non-commercial growing and use of cannabis should be legal:
Substantively, I’m not a big fan of legalization on the alcohol model; a legal pot industry, like the legal booze and gambling industries, would depend for the bulk of its sales on excessive use, which would provide a strong incentive for the marketing effort to aim at creating and maintaining addiction. (Cannabis abuse is somewhat less common, and tends to be somewhat less long-lasting, than alcohol abuse, and the physiological and behavioral effects tend to be less dramatic, but about 11% of those who smoke a fifth lifetime joint go on to a period of heavy daily use measured in months.) So I’d expect outright legalization to lead to a substantial increase in the prevalence of cannabis-related drug abuse disorder: I’d regard an increase of only 50% as a pleasant surprise, and if I had to guess I’d guess at something like a doubling.
So I continue to favor a “grow your own” policy, under which it would be legal to grow, possess, and use cannabis and to give it away, but illegal to sell it. Of course there would be sales, and law enforcement agencies would properly mostly ignore those sales. But there wouldn’t be billboards.
Not a bad idea.
(via Matthew Yglesias)