Expert answers from
Do you have to use a lot of cannabis to increase the risk of psychosis? Is the risk increased if you are just a casual user?
Should mental health professionals talk to family members about their relative's diagnosis and treatment?
This page was last updated 19 April 2013
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PLEASE NOTE: Since these films were made, the Institute of Psychiatry at King's College London has become the Institute of Psychiatry, Psychology & Neuroscience (from 1 September 2014).