17/04/2026
Research from Denmark has confirmed the findings of previous studies that there is a connection between cannabis use and schizophrenia and has underlined the need for extreme caution when considering legalisation of cannabis use.
Led by Danish researchers, this was a large study of over 60,000 participants diagnosed with cannabis use disorder using data from a population of almost seven million. Cannabis use disorder occurs when a person’ s use of cannabis cannot be controlled and withdrawal effects are experienced if they stop using it. This study found that as many as 15% of cases of schizophrenia in young men may be preventable by avoiding cannabis, with young men being more at risk than young women.
The researchers commented that legalisation of cannabis use sends the wrong message that cannabis is harmless. Dr Carsten Hjorthøj, the study’s lead, said, “This study adds to our growing understanding that cannabis use is not harmless”.
In recent years there has been a growing movement in jurisdictions around the world to legalise the use of cannabis but the evidence of a connection between cannabis and schizophrenia has been growing. These changes in laws have led to cannabis becoming one of the most frequently used psychoactive drugs. Schizophrenia is a cruel, life-changing (and often life-threatening) condition. Legislators must be made aware that legalisation of cannabis will have real and tangible human costs. And sufferers of schizophrenia and their carers should know that cannabis use will make their symptoms worse.
There is more about schizophrenia and drug use in the Living with Schizophrenia website at. https://livingwithschizophreniauk.org/information-sheets/schizophrenia-and-street-drugs/
Contact us on email at: info@livingwithschizophreniauk.org
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