You may not have found a smoking thread, but there are PLENTY of seatbelt threads out there that will have similar responses.
As for me, I have been quit for about 7-8 years now. I smoked in high school, through college and then quit being a "regular" smoker after college and only lit up when I was drinking/partying. Now, I am totally done with it, and I really don't like smelling it (my brother is living with me now and he smokes outside the house and it drives me nuts cause he reeks and the smell does get in the house).
All that said, if you want to kill yourself with smoking, by all means have at it. I think it is bs that a law can prohibit you from smoking on your own lawn or in your vehicle.
Smoking is bad for your health, indeed. But so is drinking cow milk, McDonalds, driving, sitting in front of the TV, and countless other common human activities. Why smoking has been attacked while all these other things are stil "OK" is beyond me. I think obesity and a sedentary life style is FAR worse for your health than smoking.
Personally, I like no smoking laws because I personally benefit from it, but like everything else, once one freedom is taken, more will get taken, and sooner or later it will impact a freedom I enjoy.
Bart