Why would you tell them that when you say they know it? Like - who doesn't know smoking is the devil? Wahhaha. It's on the package and all.

If I'm quitting and a "friend" decides to be helpful with advice (esp a non-smoker), I may body slam them and say a truck did it.

Quitting is a solo journey. Annoy the smoker, and they may  . . . well . . . light up. And find a new friend too.