TORONTO - Premier Dalton McGuinty says making it illegal for parents to smoke in a car with their kids is a slippery slope that could infringe on people's rights.

Doctors and health organizations are urging the province to ban smoking in cars carrying kids but McGuinty says he's not interested.

If the province bans smoking in cars with kids, McGuinty says banning smoking in houses and apartment buildings could be next.

He says he has faith that parents will listen to the risks of smoking around kids and make the right decision.

But Michael Perley, of the Ontario Coalition for Action on Tobacco, says the ban would protect children who are particularly vulnerable to respiratory problems and infections caused by second-hand smoke.

He says the province already regulates seatbelt use in cars and protecting children from second-hand smoke is no different.