eest hit the nail on the head, although I wouldn't use his cigarette rule universally, as for some people, it's more 'feeding an addiction' than 'pleasure'. It's one thing to do something voluntarily because it makes you feel good, it's another to do something because you're addicted and the longer you don't do it, the more mentally/physically/emotionally unstable you become... or something. You get the point, anyway.