If the fact that people make poor decisions is reason enough for the government to second-guess their decisions about dangerous activities such as smoking cigarettes and riding motorcycles, why on earth should the government let people make their own choices when it comes to such consequential matters as where to live, how much education to get, whom to marry, whether to have children, which job to take, or what religion to practice?
...there is no evidence that casual exposure to secondhand smoke has any impact on your life expectancy.
We can't depend on consumers to spend money they don't have on stuff they don't need, so the government has to do it for them