One study links exposure to secondhand smoke in the home with a 50 percent increased risk of neurobehavioral disorders in children.
It suggests that nearly 5 million children under 12 years old are exposed to secondhand smoke at home.
Up to eight percent of them suffer from learning disabilities, Attention Deficit Hyperactivity Disorder and other behavioral problems.
On a more positive note, the second study suggests that children 8 to 13 who don't like the smell of cigarette smoke are 78 percent less likely to start smoking later in life.
