I think that the "classification" issue is a red herring. The researchers are not asking for a reclassification,they are asking for more education for young people about the dangers of the drug. For example, the proportion of people affected by nut allergies is tiny, but we do not ignore the health implications for the few and ensure that products come labelled, "This product may contain nuts."With cannabis, the "labelling" should read "cannabis may cause or exacerbate psychotic symptoms in some people."I don't know whether or not the data is the same as that referred to by Lady Runciman, but the study (or critical review) seems pretty scientific (in terms of methodology) to me, based as it is on 35 separate studies carried out on cannabis users. The findings, according to the Guardian are as follows:"The study, an analysis published in the Lancet medical journal of previous research into the effects of the drug on tens of thousands of people, provides the most persuasive evidence to date that smoking cannabis can cause mental illness years after people have stopped using it.The overall additional risk to cannabis smokers is small, but measurable. One in 100 of the general population have a chance of developing severe schizophrenia; that rises to 1.4 in 100 for people who have smoked cannabis.But the risk of developing other psychotic symptoms among people who smoke large quantities or are already prone to mental illness is significant, the researchers say.People who smoke cannabis daily have a 200% increased risk of psychosis. They estimate that 14% of 15- to 34-year-olds currently suffering schizophrenia are ill because they smoked cannabis, a figure previously thought to be between 8% and 10%. According to the current diagnosis rates about 800 people would have been spared schizophrenia if they had not smoked cannabis."The "Lancet" itself, has changed its mind about the harmlessness of cannabis on the basis of this research:"In 1995, we began a Lancet editorial with the sincemuch-quoted words: “The smoking of cannabis, evenlong term, is not harmful to health.” Research publishedsince 1995, including Moore’s systematic review in thisissue, leads us now to conclude that cannabis use couldincrease the risk of psychotic illness."Not being a cannabis enthusiast, I have no problem in accepting this view and, indeed, it accords with my observation of young cannabis users over a 30 year period (as a youth worker).Mick
Mick Brent ● 6520d