Chronic pot-smoking as a teen probably doesn't fry your brain later in life, contrary to a 2012 study, which Politix duly reported. Apparently that study was flawed, and the IQ drop likely had nothing to do with cannabis.
Which is good news, given that America's teenagers are smoking more pot than ever before.
The IQ drop seen in the original study turns out to be normal for people with the education level and occupation of the study subjects, regardless of whether they smoked pot or not. Put another way, marijuana use as a teen is correlated with socio-economic disadvantage - which often predicts an IQ drop in adulthood. That's according to a different group of scientists, who revisited the original results, and published the new findings in the Proceedings of the National Academy of Sciences (PNAS).