‘‘Imagine secretly transporting a trunkload of beer across the United States. You will be able to get, say, a hundred people their drink for the night. But load the same trunk with whisky, and you will be able to get a thousand people their drink for the night. So you’re going to smuggle the whisky – and when your drinkers come into your speakeasy, that’s all you will be able to offer them.’’

An example of the  Iron Law of Prohibition, where banning something actually results in people using a more potent version of the banned substance.
Chasing the Scream
Johann Hari (2015)