Because he enjoys smoking? Here's an acedote for you: a man is sitting outside of a restaraunt, having a cigarette. A man walks up to the door, looks at him, and says, "You know, that's going to kill you." The man smoking a cigarette takes a drag, inhales deeply, then says, "I'll have you know that my grandpa lived to be 103." "And he was a smoker?" the other man asks.
"No." The smoker replied. "He minded his own fucking business."