A Brazilian team tried to find the connection, if any, between personality traits and the consumption of coffee, tea, and cola drinks, and smoking. Then they published a report:
“Distinct Personality Traits Associated with Intake of Coffee, Tea, and Cola Drinks and Smoking,” Diogo R. Lara, Eduardo Antoniolli, Julia Frozi, Ricardo Schneider, Gustavo L. Ottoni, Journal of Caffeine Research. June 2011, 1(2): 101-108. The authors, at Pontifícia Universidade Católica do Rio Grande do Sul and at Universidade Federal do Rio Grande do Sul, in Porto Alegre, Brazil, conclude:
“Coffee intake was only modestly related to personality traits and tea consumption showed an association with more mature and adaptive traits. In contrast, cola drink consumption was associated with more immature and maladaptive personality profiles, similar to smoking.”