President Obama says he quit smoking for one major reason: First lady Michelle Obama.
"I haven't had a cigarette in 6 years ... that's because I'm scared of my wife," Obama was overheard telling a United Nations official on Monday.
We're not positive about that six-year time frame, but it has been a while; Obama said four years ago that he still struggled with the habit.
At a 2009 news conference, Obama said: "I've said before that as a former smoker I constantly struggle with it. Have I fallen off the wagon sometimes? Yes. Am I a daily smoker, a constant smoker? No."

From NBC News:

"In an 2012 interview with iVillage, First Lady Michelle Obama said her husband had been motivated by their daughters to successfully quit for good.
"'I know that his ability to ultimately kick the habit was because of the girls, because they're at the age now where you can't hide,' Michelle Obama said. 'I think that he didn't want to look his girls in the eye and tell them that they shouldn't do something that he was still doing.'"