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The articles we select for Evidence-Based Mental Health must pass two stages: first they must pass our basic validity criteria and then the editors assess each article for clinical relevance. A number of articles meet the inclusion criteria but are not abstracted due to lack of space. We will highlight the most interesting of these here and list the rest.

The war over weed continues: as I noted in the last Et al, the UK government has reclassified cannabis from class C to B, making possession a more serious offence. This prompted a rejoinder from the chair of the government’s own advisory council on drugs, David Nutt, stating that alcohol is certainly more harmful to the population and possibly more harmful to the individual. He in turn received a dressing down from the Home Secretary for comparing the dangers of riding a horse with the risks of taking ecstasy (MDMA), but that’s another story.1 Continuing the search for long term harms due to cannabis, this typically well conducted cohort study (Acta Psychiatr Scand 2008;118:395–403) from Norway asks whether heavy use leads to depression or suicide attempts in adolescents. Buried amidst a heap of non-significant outcomes, they did manage to find a three-fold rise in suicide attempts but not until you reach your late twenties. Try making a public health warning out of that. Whatever message you come up with, you will have a hard time selling it, as this randomised controlled trial (Addiction 2008;103:241–8) shows. Motivational interviewing was compared with providing drug information in reducing …

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