Sounds very nice !! (I guess that's because i quit smoking 1 years ago :D ) Cigarets in game could for example reduce your "hunger" but as a trade off will add some addiction, you'll need to smoke a cig every X hours or your hand will shake. Could be used for trading between players, since some players will need it and ohter won't.
I trully hope VR integration is in Dean's road map !! Btw, could any dev/staff tell us if we can use some 3rd party 3D drivers, like Vireio/Tridef/Vorpx. I don't know if this could be a problem with VAC etc...