Researchers followed more than 400,000 teens until they were adults. It found that those who used marijuana were more likely to develop serious mental illness, as well as depression and anxiety.

A new study finds teen cannabis use may be linked to a doubled risk of serious mental illness, including psychosis and ...

It notes that average levels of the psychoactive ingredient in cannabis, THC, are five to 10 times higher than levels in the ...

Adolescent cannabis use doubles the risk of psychotic and bipolar disorders, with increased risks for depression and anxiety, ...

Adolescents who use cannabis could face a significantly higher risk of developing serious psychiatric disorders by young adulthood, according to a large study published in JAMA Health Forum. The ...

Teen use of marijuana has jumped significantly in recent decades - by 245% since 2000, with over 30% of U.S. high school ...

Cannabis is the most used drug with more than 10% of all Americans aged 12 to 17 having used it within the last 12 months.

A new study shows that teens with past-year cannabis use are twice as likely to be diagnosed with psychotic or bipolar disorders within 2 years of first use.