Oprah's doctor helped Queen Latifah quit smoking

Queen Latifah has publicly thanked Oprah Winfrey for helping her to quit smoking.

The Chicago star, a self-confessed "avid watcher" of Winfrey's daily talk show, was so distressed when guest Dr Mehmet Oz showed the damage caused to smokers' organs at the beginning of 2004, she promised herself she'd get serious about quitting.