Marta Di Forti, a professor of drug use, genetics and psychosis at King’s IoPPN, and clinical lead at the South London and Maudsley NHS Foundation Trust’s cannabis clinic for patients with psychosis, said: “Cannabis used for self medication is associated with a greater average consumption of THC, increased anxiety, depression and paranoia, and the reason why people first use cannabis might become an effective, and certainly a very inexpensive and easy tool, to identify cannabis users who might require monitoring, support, or even referral to intervention.”