That's not a good solution because it makes the law ambiguous as to where it should be enforced. The better solution is to treat it like alcohol - legalize it

That's not a good solution because it makes the law ambiguous as to where it should be enforced. The better solution is to treat it like alcohol - legalize it but make being a nuisance still be a violation (ie Disorderly Conduct and Public Intoxication). This makes it clear it shouldn't be enforced say in a night club or likely a homeless camp - but still allows police to intervene with people causing problems.