Secondhand Smoke Tied to Behavioral Problems

Studies have shown that living in a home where someone smokes can increase a child's chance of developing ADHD, a learning disorder, or a "conduct disorder" by abour 51%. It has been speculated that the smoke somehow changes certain chemicals in the developing brains of young children.

http://www.reuters.com/article/2011/07/13/us-secondhand-smoke-kids-idUSTRE76C4PU20110713