There were declines of approximately 2 IQ points over time in those who use cannabis frequently compared to those who didn't use cannabis. Further analysis suggested that this decline in IQ points was primarily related to reduction in verbal IQ.https://medicalxpress.com/news/2021-01-frequent-cannabis-young-people-linked.html …
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Averaged over a lot of people, a measurement is more accurate. Imagine that you could measure weight with a random error of 0.5 lbs. You would be able to get the average of 100 people with an accuracy of 0.05 pounds. S.J. Gould disagreed, but he was an idiot.
End of conversation
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