That is the topic of my latest Bloomberg column. Here is one bit:
You might wonder why we should be so worried about public marijuana use. To put it bluntly, I see intelligence as one of the ultimate scarcities when it comes to making the world a better place, and smoking marijuana does not make people smarter. Even if you think there is no long-term damage, right after smoking a person is less able to perform most IQ-intensive tasks (with improvisational jazz as a possible exception). By having city streets filled with pot, pot stores and the odor of pot, we are sending a signal that our society isn’t so oriented toward the intellect or bourgeois values. Even if that signal is reflecting a good bit of truth, it would be better not to acknowledge it too openly, just as most advocates of legalized prostitution don’t want to allow brothels on Main Street.
Basically I want full legality, but in some locales (California, Colorado) stronger restrictions on its place in the public sphere. Do read the whole thing.