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Nathan Fillion said his new word for cigarettes is: "Prison Money".
Usage examples for "Prison Money":

Dude 1: Hey, man, I wanna buy that stuff from you!

Dude 2: Okay, but you gotta pay in prison money!

Guy: Oh, yeah, he went down to the store to buy a pack of prison money!
by Kcat10 July 16, 2010