If you want to legalize weed, or not legalize weed, I don't really care. If you want to smoke weed knock yourself out. But just get yourself educated, the notion that it's not harmful is nonsense perpetuated by those who simply enjoy it:
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For this study, researchers randomly selected more than 5,000 young adults from 18 and 30 and followed up with them at varying points over 25 years. At the end of the 25 years, there were more than 3,400 participants still in the study. Their cognitive function was measured using standardized tests of verbal memory, processing speed and executive function.
They found current marijuana use was associated with poorer verbal memory and processing speed, and lifetime exposure to marijuana was associated with worse performance in all three areas of cognitive function.
The study analyzed IQ at 13, before marijuana was used, and again at 38. The results showed that the early initiators and constant users demonstrated the largest decline in IQ scores.
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Weed users have poorer verbal memory in middle age - CNN.com