Laws could punish behavior that affects other people rather than behavior that does not.
With alcohol, it is legal but certain actions that involve alcohol are not, like driving. So, driving while high would be illegal and there would still penalities for committing other crimes while using drugs, but casual use that affects only oneself would not be illegal.
However, there may be other consequences to actions like higher medical premiums or getting fired from a job for misuse, etc.
To me, laws should be designed to protect people from other members of society, not to protect people from themselves. Breaking someone else's things is illegal, but breaking your things is not.
With alcohol, it is legal but certain actions that involve alcohol are not, like driving. So, driving while high would be illegal and there would still penalities for committing other crimes while using drugs, but casual use that affects only oneself would not be illegal.
However, there may be other consequences to actions like higher medical premiums or getting fired from a job for misuse, etc.
To me, laws should be designed to protect people from other members of society, not to protect people from themselves. Breaking someone else's things is illegal, but breaking your things is not.