High IQ linked to drug use

by Jennifer Bixler - CNN Medical Executive Producer
Nov. 15, 2011

The "Just Say No" generation was often told by parents and teachers that intelligent people didn't use drugs. Turns out, the adults may have been wrong.

A new British study finds children with high IQs are more likely to use drugs as adults than people who score low on IQ tests as children. The data come from the 1970 British Cohort Study, which has been following thousands of people over decades. The kids' IQs were tested at the ages of 5, 10 and 16. The study also asked about drug use and looked at education and other socioeconomic factors. Then when participants turned 30, they were asked whether they had used drugs such as marijuana, cocaine and heroin in the past year.

Researchers discovered men with high childhood IQs were up to two times more likely to use illegal drugs than their lower-scoring counterparts. Girls with high IQs were up to three times more likely to use drugs as adults. A high IQ is defined as a score between 107 and 158. An average IQ is 100. The study appears in the Journal of Epidemiology and Community Health.

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