That's a very closed minded stance towards this. Then we should ban all alcohol as well? Banning it won't help much. Drugs are illegal in most places, just look at how that is working.
No sorry, I should not say ban but "they should never be existed" as they are only a malus.
And I don't understand the "closed mind", in that way I'm probably next (a clean and eco world)...
You made the example of the banned drugs but oh yes look at the cigarettes, they aren't banned and they are widespread like a normal thing