Not all drugs. Though, most of them need to be legalized, taxed, and made with proper protocol.
Anyone ever see
Krokodil Tears?
It's basically Heroine. If you have a viable source of quality product. We take away the Black Market of such wares. Then take the tax money to help the people on the drugs, if they want off.
People will use AND abuse drugs, REGARDLESS, if it's illegal, legal, deadly, non-pure, and/or otherwise negative. Responsible use, much like a Gun, is all we can teach and expect people to do.
Illegal drugs just make criminals out of people that don't need to be criminals.