A new US study conducted with over 1,000 children in countries around the world found that second-hand smoke exposure at home results in measurably higher levels of toxic nicotine in the child’s bodies, with younger children being even more at risk for increased amounts.

http://www.thaindian.com/newsportal/health1/kids-exposed-to-passive-smoking-have-higher-nicotine-
levels_100285140.html