I smoke tobacco in a room where I currently draw "fresh" air from, and haven't noticed any ill effects to my plants. However, I used to manage a group of townhouses that were all painted white on the interior, and it is remarkable at how much tar is produced and deposited on the walls from one smoker over a short time, as opposed to a nonsmokers' place. When one heavy smoker had moved out of his place, i went in to paint. It seemed so dark and dingy even with my worklights, but the fresh paint really brighten it up. What i'm trying to say is, even if your plant's leaves grow faster than they can be clogged with tar, all your reflective materials, glass light-guards, bulbs, and filters will be effected by the resins.