That’s a tough question and depends a lot on what substance(s) is being used. If its an opiate, have your friend take a look at ibogaine therapy: it’s seen some really amazing results for some people, who generally report that it feels like it resets something in their brain and they no longer have any desire for their preferred substance. Obviously, milage will vary, but its definitely worth looking at.

Where are you getting your information on that? Last time I checked there’s a whole lot of meats the EU won’t allow to be imported from the U.S., due to the additives and antibiotics used. This is particularly relevant to pork.