Most civilised countries have a massive, thriving, black market for drugs worth billions. Internationally probably trillions.
You may look down on drugs and you're welcome to. But the reality is that tens of millions take them, from construction sites and bog cleaners to parliament and the aristocracy. So they're hardly looked down on. They're simply illegal.
Alcohol is openly praised and celebrated despite all the damage it does. Looked down on only by usually prudulent curtain twitchers with the smell of vestries and hymn books about them. Though they also look down on drugs.