Interestingly, this appears to be partly the result of having bred cannabis to have a very high THC content, while CBD shows some anti-psychotic effect[1] 1: h

Interestingly, this appears to be partly the result of having bred cannabis to have a very high THC content, while CBD shows some anti-psychotic effect[1] 1: https://www.theguardian.com/society/2014/nov/16/new-strain-cannabis-treat-psychosis-schizophrenia-gw-pharmaceuticals-david-potter https://www.theguardian.com/society/2014/nov/16/new-strain-c...