At age 30, about 35% of men and 16% of women said they had smoked marijuana at least once in the previous year; over the same time period, 9% of men and 4% of women said they had taken cocaine. Previous-year drug users tended to have scored higher on IQ tests than non-users.
The IQ effect was larger in women: women in the top third of the IQ range at age 5 were more than twice as likely to have taken marijuana or cocaine by age 30, compared with those scoring in the bottom third. The men with the highest IQs were nearly 50% more likely to have taken amphetamines and 65% more likely to have taken ecstasy, compared to those with lower scores.
And these results held even when researchers controlled for factors like socioeconomic status and psychological distress, which are also correlated with rates of drug use.
correlate n. 有相互关系的东西,相关物 v. 1. [T]使有相互关系,使相互关联 2. [I]互相有关系 adj. 相关的,关连的
So why might smarter kids be more likely to try drugs? People with high IQs are more likely to score high on personality scales of openness to experience, says White. They may be more willing to experiment and seek out novel experiences.
Another factor could be that the messages used to attempt to deter teens from drug use particularly during the 1980s in the U.K. when the study group was in adolescence werent exactly known for the subtlety of their reasoning, so they may not have targeted the smarter group well.
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