Smoking's cool, and also good for you. Everyone knows this.
But, the current implementation of cigarettes leaves a little to be desired RE: immersion. Plus, if you offer someone a smoke, and they take one from your pack, they kind of can't smoke the rest of it (because they need the pack in their inventory to keep smoking their cigarette).
So, I suggest we have cigarette packs be containers that contain actual cigarette items, which can be individually smoked. That way, you can give people cigarettes without them only getting one drag out of the thing.
While we're at it, why not add lighter items? A small variety, so people can have some extra flair in how they present themselves. You'd need one to light a cigarette (or anything else flammable, I guess), and maybe you could even light your buddy's for them.
It's not an incredibly vital feature that needs immediate attention, but something to consider.