Under the law, a driver or passenger smoking in a motor vehicle, while someone else under the age of 16 is present, is committing an offence, and can be fined up to $250.
Second-hand smoke in motor vehicles can be up to 27 times more concentrated than in a smoker’s home.
Children exposed to second-hand smoke are more likely to suffer Sudden Infant Death Syndrome, acute respiratory infections, ear problems, and more severe asthma.
Second-hand smoke can also influence a child's ability to reason and understand, and can negatively impact behaviour and attention span.
http://www.mhp.gov.on.ca/