Shouldn't it, though? Otherwise you still have the crime and violence associated with drug use. It's certainly better than having possession also criminalized, but is it good enough? I'm not so sure.

I would suggest that maybe it's ok to continue to criminalize the sale of the more dangerous stuff, say of Schedule I drugs, but... well, marijuana is still on the Sched I list, so it's not like that list is particular scientifically rigorous.