A British study released Monday suggested that the risk of psychosis was five times higher for regular users of cannabis, adding to a growing body of evidence linking drug use and mental health disorders.

The six-year study published in the medical journal The Lancet reported on 780 people living in south London, 410 of whom were being treated for conditions including schizophrenia and bipolar disorder.

The report’s lead author was Marta Di Forti from the Institute of Psychiatry, Psychology and Neuroscience at King’s College London, who warned about the growing use of “skunk”— a powerful type of cannabis.

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