I've been thinking about this problem recently, and one idea I had is to make something like Alan Carr's book The easy way to stop smoking. This book seems to be surprisingly effective at helping people stop smoking, from what I gather, it somehow makes the idea of smoking painfully disgusting and unappealing - I assume it is in the same vein as hypnosis. I was planning on checking it out at the library sometime, and trying to write a sugar version. Perhaps also do some preliminary experiments with hypnosis, to see if it can work for this.