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It appears that habitual cannabis use, particularly from adolescence, can result in a permanent reduction in IQ.
An international team found those who started using cannabis below the age of 18 - while their brains were still developing - suffered a drop in IQ. A UK expert said the research might explain why people who use the drug often seem to under-achieve.
Dominic Hughes, health correspondent, BBC News
This might also explain why Cheech and Chong's Potheads Make Better Quantum Physicists never got beyond the I-just-made-it-up stage. (stoner)