I know that future drugs could be clean, maybe the cheaper alternatives wouldn't. But smokables are a bit boring now.
I like the idea of making the smoke an ambient nuisance for other players that are in the same area. Maybe make their clothes smell? And potentially get them high if they stay around, even more so if they are in an enclosed room.
Also think about all the bakas you could annoy after lighting up a cigarette, be it at a board meeting or a mix bar. This might help spark up some RP.