Studies have shown that frequent use of high THC cannabis can lead to psychosis, particularly in people with a genetic predisposition. However, it has been unclear how cannabis use specifically affects psychosis symptoms. In this recent paper, researchers found that in first episode psychosis patients, a history of daily use high THC cannabis resulted in more positive symptoms (i.e. additional or unusual experiences) and less negative symptoms (i.e. absence or loss of experiences) compared to those who have used lower-potency types or had never used cannabis.
