Is there a link between IQ and drug use?

According to the latest findings of the 1970 British Cohort Study, yes.

When intelligence was factored in, the analysis showed that men with high IQ scores at the age of 5 were around 50% more likely to have used amphetamines, ecstasy, and several illicit drugs than those with low scores, 25 years later.
The link was even stronger among women, who were more than twice as likely to have used cannabis and cocaine as those with low IQ scores.
The same associations emerged between a high IQ score at the age of 10 and subsequent use of cannabis, ecstasy, amphetamines, multiple drug use and cocaine, although this last association was only evident at the age of 30.

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