Moral reasoning and consistency of belief and behavior: Decisions about substance abuse

In view of implications of Kohlberg's theory of moral development, two hypotheses were considered in two independent studies: a) individuals who consider the use of potentially harmful substances to be morally wrong will be less likely to use such substances than peers who view such activities as a personal choice; and b) compared to those who are less mature, more mature moral reasoners display more consistency between their expressed beliefs about the morality of drug use and their reports of actual drug use. Two samples of college students, 29 men and 59 women in Study 1 and 46 men and 100 women in Study 2, served as participants. All completed questionnaires about their use of tobacco, alcohol, and illicit drugs and their beliefs about the morality of using these substances. Participants in Study 2 also responded to the Defining Issues Test (DIT) to assess their level of moral thinking. Results from Study 1 supported hypothesis (a). Findings from Study 2 supported hypotheses (a) and (b).