How prohibition-based policies caused a cannabis problem | Cannabis

Your article rightly raised concerns about the harms of high-strength cannabis on those vulnerable to psychosis (“I was running down the road thinking I was God”: A day at the cannabis psychosis clinic, November 16). However, it does not explain how previous prohibition-based policies designed to reduce cannabis use have increased the strength of street cannabis, the source of most cannabis for people suffering from psychosis, thereby making the problem worse.

Additionally, growing data from the Drug Science T21 Project and other global prescribing databases show that medical cannabis can alleviate a range of psychiatric and neurological disorders, without inducing psychosis. Any suggestion that rates of cannabis-related psychosis could be reduced by limiting access to medical cannabis is erroneous and risks harming patients who currently benefit from it.
Professor D Nutt and Professor Ilana Crome
Drug science