frumnotyeshivish said “The assumption the OP started with is flawed. EVERYTHING is muttar, unless G-d says otherwise. Therefore, a logical (albeit wrong) way to frame the topic is: Smoking is assur because of xyz, or stupid because of xyz. The assumptions that people leap to, especially regarding highly enjoyable acts that they clearly dislike, shouldn’t be confused with Halachah.”
Anyone vaguely familiar with Halacha is aware of the extreme and unparalleled severity of sakanah and ending life in Jewish law. That’s probably why everyone other than frumnotyeshivish wasn’t bothered by his question.