I don't need to lose weight but I had to buy this a few weeks ago as soon as I saw it. I think you could use the techniques to break any bad habit, especially if you're looking for a creative way to do it.
Amazon.com: The Writing Diet: Write Yourself Right-Size: Books: Julia Cameron
It's a diet book for intuitives!
The style is a little fluffy for my tastes ( intimately authentic self-knowledge!! ) but most of the underlying reasons make sense to me. I can see how it might be easier sometimes to overpower your feelings with some physical stimulation from a favorite vice instead of confronting them or solving the underlying problem. Writing provides clarity and makes the procrastination or distraction seem silly if you write often enough (especially when your craving strikes). She also suggests going on solitary walks, and I can really attest to that. A good walk makes everything fall into place. So yeah, 'food for thought'.