Independent 22 June 2018
What is really needed in dealing with cannabis is a “tobacco moment”, as with cigarettes 50 years ago, when a majority of people became convinced that smoking might give them cancer and kill them. Since then the number of cigarette smokers in Britain has fallen by two-thirds.
A depressing aspect of the present debate about cannabis is that so many proponents of legalisation or decriminalisation have clearly not taken on board that the causal link between cannabis and psychosis has been scientifically proven over the past ten years, just as the connection between cancer and cigarettes was proved in the late 1940s and 1950s.
The proofs have emerged in a series of scientific studies that reach the same grim conclusion: taking cannabis significantly increases the risk of schizophrenia. One study in The Lancet Psychiatry concludes that “the risk of individuals having a psychotic disorder showed a roughly three times increase in users of skunk-like cannabis, compared with those who never used cannabis”.
As 94 per cent of cannabis seized by the police today is super-strength skunk, compared to 51 per cent in 2005, almost all those who take the drug today will be vulnerable to this three-fold increase in the likelihood that they will develop psychosis.
Mental health professionals have long had no doubts about the danger. Five years ago, I asked Sir Robin Murray, professor of psychiatric research at the Institute of Psychiatry in London, about them. He said that studies showed that “if the risk of schizophrenia for the general population is about one per cent, the evidence is that, if you take ordinary cannabis, it is two per cent; if you smoke regularly you might push it up to four per cent; and if you smoke ‘skunk’ every day you push it up to eight per cent”.
READ MORE: https://www.independent.co.uk/voices/cannabis-legalisation-psychosis-billy-caldwell-william-hague-schizophrenia-a8410581.html