I believe in rule of law, but I also don't believe there is any such thing as a "victimless crime" and I don't believe possession and use hurts anyone besides the idiot killing their own brain cells.
Flame away
By the time someone is 19 the taxpayers have invested about $200,000 in them. To have a young person fry their brains before paying back this investment should be a serious crime.
If you want the benefits of being a citizen of a modern civilization then you have to accept the rules and responsibilities that come with it.