Just to put this thread to rest. Smoking isn't good for any part of your body. It's not like there's Omega 3 mixed in with all the other carcinogens. Bumming a smoke when you're out drinking some night or having one after a good boning isn't going to kill you, but doing it for an extended period of time will most definitely be detrimental to the long term health of your teeth, hair, lungs, heart, metabolism, and just about anything else associated with your overall well-being. Whilst it may not be directly "bad" for your hair like it is for your lungs, I'm positive it's not good for you either. Drugs are bad... m'kay.