Pot Not So Harmless for Teens
https://researchblog.duke.edu/2019/04/30/teenage-marijuana-use-lowers-i-q/
EXCERPT...
The researchers had tested the babies’ IQ at early childhood, then conducted regular IQ and cannabis use assessments between the ages of 18 and 38. They found that participants who heavily used weed for extended periods of time experienced a significant IQ drop, as well as other impairments in learning and memory skills. Specifically, users who had three or more clinical diagnoses of cannabis dependency, defined as compulsive use despite physical, legal, or social problems caused by the drug, showed an average 6-point IQ drop over the years. Those who only tried the drug a few times showed no decline, and those who never used weed showed a 1-point IQ increase.