People are stupid enough in their natural state, enhancing that state doesn't do them or society any good. No matter how you look at it, when you smoke dope, drink, you are intoxicated and should not be loose in public. Stay home and have smoke your brains out. But don't come to work, operate a car or be a public nuisance in your altered state.
You know, if you mandated reading books for adults, people would be smarter. Want to make that a law?