There’s a harmed party in those cases.
“Victimless crimes” are a perversion of the rule of law.
Cannabis marketing is outpacing the scientific research, but there is a growing medical consensus that it is unhealthy for human brains lungs, and livers.
If we lived in a society where health care costs were less “collectivized” then I’d have less of a problem with people abusing themselves (I’d still oppose it but not through statutes).