Children whose mothers used cannabis after the fifth or sixth week of pregnancy may be more likely to develop mental health problems in early adolescence, a new study suggests.  An analysis of data from more than 10,000 children aged 11 and 12 revealed that exposure to cannabis in utero was associated with a higher risk of developing disorders such as ADHD, aggressive behavior, conduct disorder and rule-breaking behavior, according to the report published in JAMA Pediatrics.  Read the article here.