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 may 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 risk for smoking pot “is probably going to show this IQ drop regardless of whether he or she is actually smoking marijuana,” said Isen, a lecturer in psychology at Loyola Marymount University in Los

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