Calgary's often bubbly mayor has a new portrait to chew over.

The claim that gum disease is linked to heart problems or strokes doesn't hold up to serious scrutiny, the American Heart Association says.

Barry Chappell has chewed his way out of a heavy smoking habit and into the record books, but there's more to his 79-kilogram medicated gumball than meets the eye. What do you make of the giant orb?

Nicotine replacement therapy, including patches and gum, don't seem to help people quit smoking in the long-term, researchers say.