Use of street drugs (marijuana/hash/cannabis) and alcohol have been linked largely with the probability of developing psychosis and schizophrenia. This link has been documented in over 30 different scientific studies.

According to Lancet report cannabis could be to blame for one in seven cases of schizophrenia and other life-shattering mental illness. Studies have suggested that using the drug before the age of 18 raises the risk of the condition in later life by six-fold.

Pervious researchers have established that Cannabis’s ability to cause psychotic conditions is probably related to long-term changes in the brain caused by a substance found in marijuana called tetrahydrocannabinol (THC).They predicted that the detrimental impact of cannabis on memory and cognition might be caused by brain networks being “dis-orchestrated.”Normally, specific parts of the brain are tuned into each other at certain frequencies, say the researchers. This rhythmic activity produces brain waves and allows information to be processed in order for us to react. But cannabis causes disturbances in systems involved in concentration and memory, the team found.

Now a latest research at the University of Bergenhas revealed a different effect of cannabis. In this research the patients of Schizophrenia who have a history of cannabis use show a different brain activity pattern in an FMRI than schizophrenics without prior cannabis use.

The new results provide evidence that cannabis users who are struggling with schizophrenia may surprisingly have higher cognitive abilities than schizophrenics who do not use cannabis. According to the authors, this may suggest that those who used cannabis did not have the same mental inclination for psychosis.

The experts found that schizophrenia patients with a history of cannabis use not only had consistently higher levels of brain function while taking tests, but they also answered a greater number of questions correctly. This research has revealed a new relationship between cannabis and schizophrenia. Researchers should pay more attention to this area, so that the relationship between cannabis and schizophrenia can be understood more effectively.


James Chapman,
Sarah Glynn,
Jane Collingwood