Will cannabis make you dopey?

Using cannabis often is linked to a decline in intelligence, a new review of the evidence finds. Adolescents who regularly use the drug experience declines of two IQ points compared with those who do not. Another study has found cannabis is linked to IQ reductions of 8 points, which is a significant drop. The reduction is mostly in verbal IQ: the ability to use language to reason and understand others.

Source: PNAS, a research journal

 

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