Here in the UK, the debate around cannabis cannot ignore the issue of mental health. For years, there has been conjecture in this area as the potency of cannabis, its addictiveness, the impact it has on young people, its links with psychosis, and the best way in which to address its illicit market have all been debated at length.

This report provides a concise and compelling new account of the deleterious consequences of leaving cannabis in the hands of the black market. Drawing on insights from world class academics and original research, it was commissioned to stimulate a better informed and more nuanced public debate.