A long-term study followed 329 individuals from childhood (ages 6–9) to adulthood (ages 27–30) to explore how personality traits predict alcohol use. CESAR researchers assessed personality traits using reports from children, parents, and teachers and later measured adult drinking habits. Findings showed that high extraversion and low agreeableness during adolescence were linked to heavier drinking in adulthood. This study highlights the importance of adolescent personality traits in shaping future drinking behaviors and suggests that prevention efforts could focus on highly extraverted and less agreeable teens.