Secondhand smoke harms toddlers most

November 19, 2009 The study found a link between the amount of secondhand smoke toddlers were exposed to and the amount of blood vessel damage they suffered.

Toddlers have 4 times a greater risk of exposure compared to adolescents, possibly because they tend to stay closer to their parents. The risk was twice as great for toddlers who were obese.

The study was presented to a meeting of the American Heart Association.