NZ study: Cannabis smoking by teens risks lowered IQ
“Persistent cannabis use over 20 years was associated with neuropsychological decline, and greater decline was evident for more persistent users.”
“Collectively, these findings are consistent with speculation that cannabis use in adolescence, when the brain is undergoing critical development, may have neurotoxic effects.”
The report is widely covered in the mainstream press… here’s the BBC’s story, or you can just google New Zealand cannabis study.
Perhaps the federal government will finally see the usefulness of legalizing pot.