Children exposed to secondhand smoke at home may be more likely than their peers to have learning and behavioral problems, according to a new study.
Researchers found that of more than 55,000 U.S. children younger than 12 years, six percent lived with a smoker. And those kids were more likely to have attention-deficit hyperactivity disorder, a learning disability or "conduct disorder" than children in smoke-free homes.
Read the whole thing. They admit their study is flawed and then cover a range of indirect possibilities as to how this might happen.
Never once do they consider that the same thing which causes smoking also causes ADHD.
These children have the same biological condition as their parents. And it's probably a strep infection.