I think I've heard it once before, but usually not because I normally have people over, music on, or both. It makes me fucking wonder, damn these walls are thin... I don't like that. Not the fact that he's smoking, but shit... if I can hear that what the hell have others heard me do? =(
Dude, go knock on his door and just hold a nugget up to the peephole. Instant smoke buddy! unless your neighbor is a crazy person.