Children Suing Parents due to Second-hand Smoke?

According to Canada.com:

"Children should be able to sue their parents for exposing them to harmful second-hand cigarette smoke, says an Alberta doctor.

Dr. Larry Bryan said a puffing ban in cars or homes would be very difficult to enforce, but the message would come across loud and clear if smokers were held legally responsible for their actions through exposure- related lawsuits.

"I suppose what ultimately should be done is a childhood victim of second-hand smoke should legally sue the smoker in the home," said Bryan, a former president of Calgary's Foothills Hospital."

Where would it all end?