If those other areas didn't export their drug users to the big cities, what would the situation be in the big cities? It's like if drinking was only allowed in

If those other areas didn't export their drug users to the big cities, what would the situation be in the big cities? It's like if drinking was only allowed in New Orleans, wouldn't all the drunks and abusers of alcohol go there? That doesn't mean that drinking creates that problem. People take other drugs already.