For me it was a case of the early morning runs. Not pooping so if you read that in you are sick. I mean getting out and going running, works on keeping weight in check and you just need to get passed the puking after a mile bit and your home free.
Sounds bad I know, I was determined not to go back to smoking, I have now been 6 months clean and free of smoke and tar while losing almost 30 pounds. To me the initial cost was high; the punishment I put myself thru for the sake of my own health, but im happy I have done it. Tried sunflower seeds, my jaw hurt, cold turkey caused me to gain weight so I gave that up, I started watching what i ate while smoking and saw the weight drop right off, then it just for some reason stopped. I Stopped cutting weight and only saw one option, work out. Cant do that as a smoker so something had to go. For the record, I went from throwing up and wanting to pass out after a mile to running a sub 7 mile for 3 miles, dont think it cant be done.
Get healthy, lose weight, get toned, keep more money. Those were all factors for me, its different for others but I can tell you it is one of the best things I have ever done.
-Chris