My husband always says that smoking may not send you to hell, but it will make you smell like you've been there.
Seriously, I hate smoking, and I think Christians should overcome anything that has them in bondage, but some do that immediately upon salvation and others struggle for years. It's a nasty habit to kick. However, I don't think you can use the Scripture for defiling the temple and then say it's ok to overeat, or even to eat globby greasy stuff which also defiles the temple. Eating stuff like that may be more socially acceptable among church folks, but it's probably just as wrong as smoking.