While it is the government the buckles and implements these laws it is almost always big business that is behind them. The reason there are seatbelt laws are not because the government wants to protect us, it is because the auto insurance companies wanted them so that if there is an accident the odds of serious injury go down and with that so do their potential liabilities.
Likely this is a similar thing. I'm sure some insurance company checked out a study that showed how many fires and injuries occur each year from cigarettes and they decided to get a law passed to reduce that number so they would have to pay out less.
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