Banning tobacco is plausible because it's somewhat difficult to grow the plants. But you can't ban alcohol. Anybody can produce it. You can literally produce it by accident.
Yeast has been genetically modified to produce psilocybin ( https://www.sciencedirect.com/science/article/pii/S109671761... ). Researches have yielded the equivalent of about 60g dried shroom in only 1 liter of solution. When psychedelics become as easy to produce as beer, the world is gonna be a whole lot weirder.