A typically thought provoking take from Tyler Cowan:
I propose that cities and suburbs restrict the sale and usage of marijuana to the same areas we use for garbage disposal and other “zoned out of sight” enterprises. We needn’t throw anyone in jail: If people or businesses violate these strictures, keep hitting them with the equivalent of parking tickets or injunctions, much as you would for an out-of-place repair shop.
It should be possible to visit Colorado without knowing that marijuana is legal there. If someone is determined to ingest it, they can either drive to an industrial zone or order it online, and smoke it at home or up away in the mountains.
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.