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Not a very good study
January 25, 2008 by Anonymous, 1 year 41 weeks ago
Comment id: 27153
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For one, only users of both tobacco and cannabis were used, so withdrawal effects of marijuana use could be explained in part by the relationship between the 2 drugs. A second possible explaination is that it is due to expectancy of symptoms, or a placebo effect. The trials were conducted without a placebo control.
Also, only 9 subjects completed the trial. A larger trial is needed to draw any good conclusions.