I mean PCP I guess, yeah that should still be illegal.
Coke etc? The wealthy have been doing that with no reprecussions forever. Weed? Yeah right.
Most drugs if done in a safe way (Which is much more likely if you make it legal) are not dangerous.
Heroin maybe is bad, but, sell it straight up, let people use it, and if they are addicted get it safely for a fixed price, but inform everyone how dangerous it is and addicting. Offer help getting off it ifyou want. Don't put the power in the hands of criminals though.
If drugs were available legally, but were discouraged, and resources were given to help people get off them, things would be waaaay better.