Study questions link between teen pot smoking, IQ decline

Research suggests another factor responsible for both marijuana use, decline in intelligence

NEW YORK — A new analysis is challenging the idea that smoking marijuana during adolescence can lead to declines in intelligence.

Instead, the new study says, pot smoking might be merely a symptom of something else that’s really responsible for a brainpower effect seen in some previous research.

It’s not clear what that other factor is, said Joshua Isen, an author of the analysis. But an adolescent at…

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