Alice Robb examines some research showing that drinking and drugging in adulthood correlate with higher childhood intelligence:
Drawing on the results of the National Child Development Study, which tracked for 50 years all British babies born during one week in March 1958, [evolutionary psychologist Satoshi] Kanazawa found that kids who scored higher on IQ tests grew up to drink larger quantities of alcohol on a more regular basis than their less intelligent peers. He evaluated other factors, including religion, frequency of church attendance, social class, parents’ education and self-reported satisfaction with life, and found that intelligence before age 16 was second only to gender in predicting alcohol consumption at age 23.
In Kanazawa’s model, illicit drugs constitute another evolutionarily novel experience—and he (and others) have also found a link between high IQ and experimentation with drugs. In Kanazawa’s study, the higher a respondent’s IQ before age 16, the more psychoactive substances he or she had tried by age 42. Another study found that 30-year-old women who had earned high scores on an IQ test at age five were more than twice as likely to have smoked weed or used cocaine in the previous year; men who had scored highly on IQ tests as children were 50 percent more likely to have recently consumed amphetamines or ecstasy.