SANDIE RINALDO: Football season is now fully underway on both sides of the border. And whenever you have pro football there is one thing you can bet on, people will wager on the outcome of the games. And as the scope of betting grows, so do the problems that come with it. But scientists are now discovering that gambling addictions may have a biological basis. CTV's medical specialist Avis Favaro explains.
AVIS FAVARO (Reporter): Most people can visit a casino, bet on sports or buy lottery tickets without a problem. But for some, gambling becomes a potent addiction.