Teenagers already at clinical high risk for psychosis performed worse on standard cognitive tests when they used both cannabis and tobacco, compared with peers who used neither substance or only one.

New research shows that among people at clinical high risk for psychosis, cannabis and tobacco co-use was associated with lower cognitive performance compared to healthy controls. The novel study ...

It’s 4/20 - but U.S. teens should avoid cannabis unless they want to stunt their brain development, according to a new study from California researchers. Teenagers who use cannabis in any way have a ...

A new multisite study published in Nature Mental Health found that using cannabis and tobacco together increases the risk of developing psychotic disorders like schizophrenia among those considered ...

A new multisite study published in Nature Mental Health found that using cannabis and tobacco together increases the risk of developing psychotic disorders like schizophrenia among those considered ...

Cannabis use among teenagers is linked to delayed cognitive development and worse memory over time, the largest US study to date showed. In an analysis of over 11,000 teenagers, cannabis use was ...

Cannabis potency and use among teenagers has increased in recent years. Researchers are looking at the risks of smoking and ...

A sweeping review of over 8,000 participants reveals how cannabis use during the teenage years may reshape the developing brain, raising urgent questions about long-term risks and early intervention.