President Obama has finally kicked the habit.

First lady Michelle Obama says her husband hasn't had a puff of a cigarette in about a year, and she is proud of him for conquering his bad habit.

She said she never pestered him about quitting because she knew it was "a personal challenge for him." She also hasn't talked to him much about his decision to lay off the butts. "When somebody's doing the right thing, I don't mess with them," she joked.

What made him finally stop? Daughters Malia and Sasha are getting to the age, she said, where her husband wants to be able to "look them in the face" and say he doesn't smoke.

In a wide-ranging interview with a dozen reporters over lunch in the Old Family Dining Room at the White House, the first lady discussed her national Let's Move! campaign to end childhood obesity in a generation. She said the year-old campaign will be expanded over the next couple of years, starting with new public service announcements she will unveil tomorrow that will potentially reach 200 million viewers.

As the group dined on greens from the White House garden, pan-roasted rockfish, seared rack of lamb and key lime tarts, all served on green Truman china, the first lady also:

Would not state a position on gay marriage. "I'm not getting into that."

Said she and her family"participate in a church" and have a spiritual life. But she wouldn't discuss religion any further. "I have a hard time talking about something that's so personal," she said. "Some things are mine."

Wouldn't reveal who she will vote for in the Chicago mayoral race, where her husband's former chief of staff, Rahm Emanuel, is the front runner. "My vote is mine, too."

Said she doesn't choose what to wear in order to send a message. "My decisions aren't so complex," she said. Instead, she said she is driven by "real practical stuff" such as whether what she's wearing will allow her to kneel down to talk to kids or give a speech outside without freezing.

Said she and her husband keep their marriage strong with "a lot of laughing."