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A powerful 'skunk-like' form of cannabis is associated with a quarter of new cases of psychosis, according to a new study.
A six-year study by researchers at King's College London found that the potent form of the Class B drug increased the risk for daily users by five - and tripled the risk even for casual users.
The study did not find any such link for the milder form of cannabis, known as hash.
The research followed 800 people aged between 18 and 65 in south London, including 410 who had suffered psychosis and 370 healthy patients.
Lead author on the project, Dr Marta Di Forti, called for a "clear public message" on the use of cannabis, based on the findings.
The results show that psychosis risk in cannabis users depends on both the frequency of use and cannabis potency. The use of hash was not associated with increased risk of psychosis.
As with smoking tobacco and drinking alcohol you need a clear public message.
When a GP or psychiatrist asks if a patient uses cannabis it's not helpful; it's like asking whether someone drinks. As with alcohol, the relevant questions are how often and what type of cannabis. This gives more information about whether the user is at risk of mental health problems. Awareness needs to increase for this to happen.