High-potency cannabis linked to risk of psychosis

What they found: The findings suggest people who use high potency cannabis are more likely to experience addiction and are more likely to experience a psychotic disorder, such as schizophrenia.

• The authors make the case for more public health guidelines to make cannabis use safer.
• While higher potency and more frequent use of cannabis increases risk, the authors stopped short of associating it directly with psychosis-like symptoms.

Yes, but: The studies reviewed did not use a consistent measure to evaluate what is "low" versus "high" potency for THC, and the authors rated most studies as having just poor or fair quality design.

• The strongest evidence of links between marijuana use and psychiatric disorders is in people with a preexisting genetic or other vulnerability, per NIH.