While the consumption of alcohol, particularly on a daily basis, has not been linked to any cognitive performance benefits, there exists a compelling amount of data on the correlations between alcohol use and a handful of positive variables. These correlations surprisingly begin far before a person’s first drink, as suggested by a Finnish study which observed 3,000 twins and found that the sibling who could speak, read, and express language first was often the first sibling to drink alcohol and to drink more throughout life. Improved speaking, reading, and writing performance is also correlated with higher alcohol consumption for middle school, high school, and college students.
The link between intelligence and alcohol consumption could be explained by higher stimulation-seeking tendencies. Under this theory, children that desire additional stimulation seek it through speaking, reading, and writing, and that same stimulation-seeking tendency leads adolescences to drink more and to start at an earlier age.
Psychologist Satoshi Kanazawa has delved deeper into this topic and has concluded that intelligence is only second to gender in the most influential variables in determining not only alcohol consumption, but also all illicit drug consumption as well. Each person’s usage of drugs begins with trying them for the first time. It is certainly plausible that intelligence increases self-confidence and the courage to try new things, which leads to adolescents beginning to drink at a younger age.
Another factor that may influence the correlation between intelligence and alcohol consumption is the social culture of college, which encourages binge alcohol drinking. Factors such as social and peer influence are difficult to quantify but may significantly emphasize the correlation between intelligence and alcohol consumption.
http://www.newrepublic.com/article/115802/intelligence-and-drinking-studies-say-theres-correlation