Comparing Message Appeals Employed in Efforts to Prevent E-cigarette Use Among Students in a US University.

College students tend to underestimate the risk associated with e-cigarette use while overestimating the prevalence of this behavior. The purpose of this study was to compare the perceived effectiveness of social norms messages to other theoretical appeals regarding the prevention of e-cigarette use. Researchers surveyed 586 college students who assessed five messages. Different appeals were featured in each message. A Rasch Rating Scale Model (RSM) was used to calibrate students' responses to seven items assessing each communication message. The results from the multiple regression models revealed that vape-users were less receptive to the messages than abstainers, and among vape users, males expressed lower message endorsement than females. Overall, the clinical appeal received the highest endorsement in Rasch calibrated logit unit measures, (M = 3.36 for abstainers and M = 2.41 for vape-users), whereas the social norms message was the least favored (M = 1.41 for abstainers and M = 0.22 for vape-users). Qualitative analyses revealed common themes of skepticism and a need for credible scientific information. Findings suggest college students prefer clinical evidence over normative information. An experimental design is needed to determine the extent to which messages influence behavior change.