Please, help... the ol' ball 'n' chain.

It's funny how things that you don't like about yourself can so slowly become your permanent habits. Like chewing your nails or smoking. "It's just this once and then I won't do it anymore," you say to yourself. But then you find yourself doing it more and more. And doing it even when you're not prompted by the outside stimulus that was making it happen before. Then notice by contrast how hard it is to keep good habits going? You can try and try to make something like going to the gym or eating better part of your routine but you slip up once or twice and nada. So here's my idea, make the things that are good for you like guilty pleasures. And punish yourself with things like chocolate and cigarettes.