Legal drugs cause their fair share of trouble. Consider the social ills brought to us by Philip Morris, Budweiser, and 17th century British opium trade. Profit making companies have an incentive to promote addiction as do governments who base too much revenue on drug taxes.

Finding a happy medium between black market and free market is a tricky problem. I suspect it will continue to require a complex set of regulations. I'm quite happy to see states in America experimenting with various policies towards marijuana. Hopefully one of them will land on something not worse than what's happening right now. Hopefully too, the attitudes of the WHO will encourage even more experimentation.