Stop Smoking Two Years Before She Died

One woman in the book died of natural causes at 122. She stopped smoking two years before her death. So I'm pretty sure that there would not be the argument for people to start smoking on a list of things you should do to live a long life. But why add it then? Like, what is the value of these things if they're going to contradict some of the other things that you were talking about in the rest of the book?