Some expectant mothers who smoke during pregnancy may be exposing their baby to the risk of the attention deficit/hyperactivity disorder (ADHD), according to a study published in the journal Biologicalsychiatry.
The study states that prenatal exposure to smoking in the mother's womb puts genetically susceptible children at an increased risk the disorder.
During the course of study, the researchers studied male and female twin pairs, aged 7-19 years, so as to assess the relationship between genetic variations, prenatal substance exposures, and ADHD sub-types.
"These data highlight a new risk of maternal smoking, increasing the risk for ADHD in their children. ADHD, in turn, increases the risk for substance abuse. Thus, it appears that in utero exposure to nicotine may help to perpetuate a cycle across generations that links addiction and behavioural problems," added Dr. John H. Krystal, Editor of Biological Psychiatry.