Mostly smoking. At least, it's the most damaging habit I have. I'm at the point where I'm starting to get fed up with the smell and the ashes all over the place and burning my skin because of these stupid bands that stop the cigarette from burning down to the filter, so if you aren't continually puffing away it goes out and then when you relight the cigarette the damn thing engulfs itself in flames and half of it falls off onto the floor, my bare skin...you get the picture.