Legally, California has also been a pioneer, at least within America. In 1996 it was the first state to allow marijuana to be grown and consumed for medicinal purposes. Since then, 13 states and the District of Columbia have followed, and others are considering it. But this year California may set a more fundamental, and global, precedent. It may become the first jurisdiction in the world to legalise, regulate and tax the consumption, production and distribution of marijuana.
[From Legalising marijuana: The law of the weed | The Economist]