Pregnancy and Offspring

Researchers found that infants of mothers who smoked marijuana at least once a week or more during gestation showed increased hyperactivity, impulsivity, memory dysfunction, lowered IQ scores, and delinquent behavior in childhood. During adolescence and young adulthood symptoms included memory problems, lack of concentration, higher rates of drug use, hyperactivity, as well depression, psychotic, and schizophrenic-like symptoms. Several other studies involving thousands of children will have data to report, as well. Earlier longitudinal studies have shown that use of marijuana as well as use of tobacco are more than twice as likely in adulthood compared with those whose mother did not use marijuana during gestation.