Way of adressing an individual who's constant ignorant attitude or idiotic actions make them appear as if they are hammered 24/7.
Bob: Dude, I ate the dry ice in science class and fog came out my nose!
Steve: It's gonna be coming out you're ass in a few hours ya friggin' dope smoker!
I agree with another definition:
I also know half-smokes as "somewhat spicy smoked sausage(s), usually made of pork and beef." But, I know them as very small about half the size of a normal breakfast link, (which would make it a horrible nickname).