I have. Quitting smoking is a little bit harder because smoking is a binary state. You either smoke or you don't. Where as with gaining the lost weight, it doesn't happen over night and thus easier to maintain. At any rate both are long time struggles that are hard to hack.

James' blog post about losing weight was somewhat of an inspiration and validation of the diet I was following at the time and its effectiveness. One advice that I still follow is when I'm pressured into food that may contain flour or sugar I just say I'm allergic which works great.