Rachael A.Record - School of Communication, San Diego State University, ۵۵۰۰ Campanile Dr., San Diego, CA ۹۲۱۸۲, USA
Maxwell Groznik - Department of Communication, University of Kentucky, ۳۰۸ Lucille Little Library, Lexington, KY ۴۰۵۰۶, USA
Mark A. Sussman - Department of Biology, San Diego State University, ۵۵۰۰ Campanile Dr., San Diego, CA ۹۲۱۸۲, USA

Background: Trends in young adult use of electronic nicotine delivery systems (ENDS) and experimentation with do-it-yourself (DIY) e-juice mixing are growing around the world. Theoretical frameworks for examining secondary behaviors (i.e., mixing) embedded within a primary behavior (i.e., vaping) are limited, leading to challenges in scholarly understanding of behavioral performance. This study explored the theoretically driven factors surrounding ENDS users’ decision to mix DIY e-juice through a multiple behavior test of the theory of planned behavior (TPB).Methods: An international sample of young adult participants aged ۱۸-۱۹ (n=۲۰۳) was recruited from Prolific for an online crosssectional survey. Path modeling tested four theoretically driven models to explore behavioral performance of mixing.Findings: The data supported TPB expectations and revealed new paths for secondary behavior. Primary perceptions of attitudes, norms, and intention were predictive of the same secondary perceptions. In addition, for both primary and secondary behaviors, perceived norms were a function of perceived attitudes. For the secondary behavior, normative influence was experienced indirectly through perceived attitudes.Conclusion: DIY e-juice mixing is a product of perceived attitudes and behavioral control surrounding mixing as well as perceived attitudes, norms, and intention surrounding general ENDS use. While unregulated DIY experimentation increases among youth, these findings provide a lens for public health efforts seeking to reach and reduce use. Understanding DIY e-juice behaviors isessential to anticipate stockpiling behaviors and negative outcomes from amateur experimentation.

Vaping, Electronic nicotine delivery systems, Behavior, E-cig use