It's selfish to push your spouse to start smoking.
Tony is a heavy smoker and for the thousandth time his wife Tonya is trying to get him to quit.
Tony wants to disagree about quitting.
Tony tells Tonya that he's addicted and that quitting is not a simple decision he gets to make.
Tony tells Tonya that he's not quitting and it would be a lot better if Tonya just starts smoking, so they can do it together.
Tonya backs off arguing and instead calls up a doctor to see how an addiction is treated and solved.
Tonya relents and agrees to start smoking and eventually they both die from a vast array of cancers.