The cannabis / psychosis link

New Scientist reports British researchers believe they have established a clear correlation between cannabis use and an elevated risk of psychosis later in life:

On average, cannabis smokers have a 41% greater chance of suffering from such disorders than those who didn't inhale, the new study finds. And the likelihood increases with increasing cannabis use, with heavy users - who smoke daily - three times as likely as non-users to develop psychotic illnesses.

» more at: www.newscientist.com

Posted By amazingdrx at 2007-07-28 08:02:07 permalink | comments

Tags: cannabis psychosis research UK

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omgoleus : 2007-07-28 14:33:21

Note that the only thing new here is a meta-analysis, where researchers (possibly feeling lazy) go over the results of all the previous studies in a field to see what they say collectively, rather than doing any new work.

This has the effect of improving statistical power (because you effectively have a big new sample composed of all the people in all the studies) but most definitely does NOT solve any methodological problems or limitations of the original study.

So, if there were any biases in the original studies, the biases are still there in the meta-analysis. Caveat emptor, as the somewhat-misapplied saying goes.

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The cannabis / psychosis link

Posted By amazingdrx at 2007-07-28 08:02:07 permalink | comments

Tags: cannabis psychosis research UK

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