by all means you are free to do what you want. but as ozko suggested there is more to it than just personal effects and second hand smoke. i would imagine the medical costs and such that are funded by tax payers would be fairly high, so getting rid of that financial burden would be of much benefit to everyone else. its not just wasted money on something that could be easily avoided.
Yeah I was wondering when this would come up, and it's probably the only real issue here.
They always do shit like this to keep integrity in the public healthcare system. Bike helmets, seat belts, etc. are all there to keep the healthcare system going, and so we don't waste taxpayers money on stupid people. In my opinion there are two solutions: one is to fund healthcare more using money from private schools, private hospitals and military (priorities are different, I know). The other is to create a system where if your health problems are caused by negligence such as smoking, drinking, or not wearing a seat belt, you are required to pay back the public healthcare system.
It's all very complex and seems unnecessary and excessive. But I think in order to preserve our free choices we need to rethink the healthcare system. We can't just keep putting laws on things to make them go away - laws don't work like that. And coercive legislation, such as this one, I personally think is wrong.