The more contact the boys had with tobacco smoke the more likely they were to have recognizable behavior problems, such as extreme excitability and aggression.

VOA: special.2009.01.13

It can decrease intelligence, create behavior problems and slow a child's growth.

VOA: special.2009.08.31

have problems with paying attention, controlling their behavior and being overly active.

VOA: special.2010.05.26