Children are vulnerable to second-hand smoke

Children are particularly vulnerable to the effects of second-hand smoke because they breathe more rapidly and have less developed airways, lungs and immune systems.

Source: Secondhand smoke @ NHS Smokefree

Image by Challiyil Eswaramangalath Vipin from Chalakudy, India (cigarette.. like a cigarette in the rain) [CC-BY-SA-2.0], via Wikimedia Commons