I always figured the break down in communication and easy transport would lead to a rise in "home grown" narcotics such as the ever-present marijuana and relatively easy to manufacture meth. Long lines of transport and the necessity for refinement would most likely make things like cocaine and opiates (morphine, heroin, etc) less common except in the areas they're indigenous to.
I would also expect a rise in the numbers of old-school moonshiners, due to alcohol's versatility. Just think, it isn't just a depressant, it has medical uses as well as being a fuel source, and therefore it is three trade goods in one... Some of those Tennessee mountain folk would go from being somewhat outcast by their neighbors to being perhaps the most important people on their particular hillside...
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