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Smoking marijuana regularly as a teen may lower IQ scores as an adult

September 3, 2012 6:00 am Published by Leave your thoughts

Ranger on marijuana grows eradication duty

A long-term study has concluded for the first time that regular marijuana use before age 18 causes significant and lasting harm to intelligence, attention span and memory.

According to a new study (and reported in USA Today and CBS News, among other sources), there was an average eight-point decline in IQ among “persistent, dependent” users of marijuana younger than 18. About 5% of the study group were considered “marijuana-dependent” — using more than once a week before they were 18 years old

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