Application of vested interest theory to prevention of non-medical prescription stimulant and marijuana use: Unforeseen benefits of attitude-behavior inconsistency

Abstract

BackgroundVested interest (VI) has been found to enhance attitude-behavior consistency in several contexts. With an eye toward a potentially novel method of prevention (i.e., reducing perceived VI to minimize attitude-behavior consistency among those positively inclined toward psychotropic substance use), the current investigation explores whether VI moderates attitude-intention consistency regarding nonmedical use of prescription stimulants (NUPS) and marijuana. MethodsEmphasizing prevention, the study focused exclusively on non-users. Study 1a assessed college students (N = 310) attitudes, VI, and intentions regarding NUPS among those with no prior NUPS experience. Respondents were sampled using Amazon’s Mechanical Turk. Study 1b investigated marijuana-abstinent college students (N = 93), recruited from college classrooms. ResultsThe pattern of results was similar in both studies. In addition to an association between attitudes and VI, analysis revealed main effects for attitudes and VI on substance use intentions. Moreover, VI moderated the attitude-intention relationship (p < .01). Attitudes were most weakly associated with usage intentions when perceptions of VI were low (vs. moderate or strong). ConclusionResults of these studies replicate and expand prior findings relating VI to drug use, and suggest a potential path for future prevention efforts. The current study was cross-sectional, however if the causal pathways are as theorized, an intervention that reduces subjective VI has the potential to reduce positive attitudes while simultaneously reducing the influence of favorable attitudes on intentions.