Britney Wants To Quit Smoking!

I'm not sure if it's true, 'cause if it is, she doesn't seem to be very successful in her efforts, but a source tells Foxnews.com that Britney's trying to give up the cancer sticks.

The report says Queen B has a 40-plus-a-day habit and that "it's her one last vice and she knows that her kids hate her doing it too."

We caught Brit on July 18, smoking in front of Sean Preston -- maybe being confronted with this reality encouraged her to want to make a change?

Bravo, Brit! Work those fags right outta your life!!!! For your own good and for your kids!