Supposed Marijuana And Schizophrenia Link “Overstated”

[Editor's note: This post is excerpted from this week's forthcoming NORML weekly media advisory. To have NORML's media advisories delivered straight to your in-box, sign up for NORML's free e-zine here.]

Clinical evidence indicating that marijuana use may be casually linked to incidences of schizophrenia or other psychological harms is not compelling, according to a scientific review published online by the journal Addiction.

Investigators at the University of Bristol, Department of Social Medicine assessed the potential health risks of cannabis, particularly whether use of the drug may be causally linked with mental illness.

Authors wrote: “We continue to take the view that the evidence that cannabis use causes schizophrenia is neither very new, nor by normal criteria, particularly compelling. … For example, our recent modeling suggests that we would need to prevent between 3000 and 5000 cases of heavy cannabis use among young men and women to prevent one case of schizophrenia, and that four or five times more young people would need to avoid light cannabis use to prevent a single schizophrenia case. … We conclude that the strongest evidence of a possible causal relation between cannabis use and schizophrenia emerged more than 20 years ago and that the strength of more recent evidence may have been overstated.”

In 2007, an analysis in the British medical journal The Lancet estimated that experimenting with marijuana could increase one’s risk of developing a psychotic illness later in life by some 40 percent. Following this report, Parliament in 2008 voted to reclassify marijuana as a Class B substance, making its possession punishable by up to five years in prison.

University of Bristol researchers also criticized Parliament’s reclassification of the drug, which took effect earlier this year. They concluded: “The only important possible benefit of prohibition is prevention of cannabis use. There is little or no evidence that it effectively achieves this benefit. Patterns of cannabis use in the population appear to be independent of the policy surrounding use, and criminalizing individual cannabis users does not appear to modify their use in a healthy way.”

Overall, investigators determined that marijuana’s most significant health risk was its association and reinforcement with tobacco smoking.

British Prime Minister’s Cannabis Conundrum: Will Science or Media Hype Guide Him?

Let’s hope for sanity’s sake that British Prime Minister Gordon Brown is not as bonkers as so many editors and producers are today in the United Kingdom regarding the issue of cannabis. After foreshadowing his intent last week to re-classify cannabis to fetch a harsher penalty and direct police to make more arrests, Mr. Brown will apparently face a much anticipated advisory report from the highly respected, and rarely unobserved, Advisory Council on the Misuse of Drugs (ACMD) that, like virtually every major government report or commission review, advises for more, not less tolerance and punitive measures for cannabis consumers.

Will Brown kowtow to this current (and really bizarre) epoch of British media Reefer Madness or respect the ACDM’s logical and pragmatic recommendation not to increase the penalties for cannabis? Why does the British Home Office (and apparently the opposition Tory leader David Cameron as well) continue to pretend The Netherlands–and their ongoing, 35-year positive experience with controlled cannabis sales–does not occur just 95 miles away? (more…)

Tabloid ‘Journalism’ Hits New Low

According to a recent news item making international headlines, a journalist in a forthcoming BBC ‘documentary’ will “inject” herself with the “main ingredient” of so-called “skunk cannabis” in an effort to warn viewers of the “dramatic” and “unpleasant” effects of marijuana. (more…)