Scattered all through the games, there are cigarettes, packs of cigarettes, and cartons of cigarettes. If all clutter items can be used now, it'll be used for something because I'm sure tobacco products won't be cut (pun etc).
I can't see them being used for guns or armor, so I'd personally like to have an animation that places a cigarette in your mouth and to light it with a flip lighter/zippo when in 1st-person. Just another almost pointless feature added for immersion. It'd just be nice to wander around like that.