Smoking is considered "a problem" to society because intelligent, caring people that notice that smoking injuries and medical conditions cause sorrow, strife, and excess medical waste. They've run huge propaganda campaigns to get us to care about this problem: literally "other people are dying because of this habit so you need to hate this habit."
But the people who smoke usually don't care about the social sorrow & strife caused by smoking, and they don't spend a lot of time trying to figure out how to provide hospitals or lung cancer screenings. They just smoke because they enjoy it and don't really anticipate or care about the consequences.
So really, what's going on is that well-intentioned meddlers are trying to meddle in the lives of people who don't share the utopian, collaborative values of the meddlers.
The answers that actually solve "the problem"--ban cigarette sales outright, imprison or exile smokers, refuse medical treatment to smokers--are unthinkable to the meddlers, because they genuinely believe in their principles, especially "everyone in society should be taken care of by competent people".
(For the record: I don't smoke, and I don't think anyone should smoke.)