Chinese "Fat Prisons" where people can sign up to be locked away for two to four weeks, spending four hours a day in exercise classes, being fed controlled diets, and not being able to leave - for about 1000 dollars.
That sounds like reverse idea of gamblers and alcoholics who asks not to be let in a casino/ bar:
Please don't let me out.
I think it is pretty easy to lose weight or stop smoking - just be locked away somewhere there is no access.