FYI.
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h3. One: Jonah Lehrer tries to end the "marijuana makes you stupid" debate ("Wired":http://www.wired.com/wiredscience/2011/08/does-marijuana-make-you-stupid/):
bq. Once these population differences were corrected for, the long-term effects of...
Once these population differences were corrected for, the long-term effects of marijuana use disappeared: the scientists found that "there were no significant between group differences." In other words, the amount of pot consumed had no measurable impact on cognitive performance. The sole exception was performance on a test of short-term verbal memory, in which "current heavy users" performed slightly worse than former users. The researchers conclude that, contrary to earlier findings, the mind altering properties of marijuana are ephemeral and flee.