Why don't you just tell him he sold you fucking tobacco and you did not ask him for ciggerettes, that he needs to make it right with you or word will get around how he is ripping people off now. While that might just piss off a few weed smokers the base heads he rolls with might shank his ass for playing the same game.

The counterfeit idea is awesome though, and I would use a 50 for extra rippage. (and iu might want to pass a few to some other ppl to spread the rippage around, make sure a few desperate crack heads get fakes) If he is that big of a loser, he shouldn't be too hard to fool.