Only crimes should be prohibited

As far as drug prohibition is concerned we must assume everyone is peaceful and that drug use has no associated violence. (Often the violence that we do see is a result of there being no legal recourse in the trade.) We deal as far as the law is concerned with the drug-taking in isolation and expect that if any violence arises then that behaviour will be dealt with on its own. We are isolating the drug use itself. Since the drug user is (otherwise) peaceful prohibition can only be for the benefit of the victim... but there is no victim by definition. We cannot hurt ourselves. There is no reason to hurt someone who is not hurting you... so there is no reason for prohibition. It makes no sense to punish someone for their own good. There is no reason to prohibit a non-crime. Only crimes should be prohibited.