Familial factors may not explain the effect of moderate‐to‐heavy cannabis use on cognitive functioning in adolescents: a sibling‐comparison study

Aims To examine whether moderate adolescent cannabis use has neurocognitive effects that are unexplained by familial confounds, which prior family‐controlled studies may not have identified. Design A quasi‐experimental, sibling‐comparison design was applied to a prospective, observational study of adolescents with moderate cannabis use. Participants were recruited from 2001 to 2006 (mean age = 17 years). A second wave of data was collected from...