Need Frustration and E-Cigarette Use and Dependence Among College Students: The Mediating Role of Ruminative Thinking

<i>Background</i>: The prevalence and dependence of e-cigarettes have increased among young adult college students in recent years. Though several independent risk factors for e-cigarette use and dependence have been identified, research employing theory-informed models to predict e-cigarette use and dependence is limited. <i>Objectives</i>: Using Self Determination Theory (SDT), e-cigarette use and dependence may be understood as stemming from need frustration that impairs autonomy, competence, and relatedness, which increases vulnerability for negative health outcomes, including e-cigarette use. Further, need frustration may relate to more e-cigarette use and dependence via higher ruminative thinking, which is known to relate to both need frustration and tobacco use. <i>Method</i>: This study tested this path model (i.e., SDT need frustration components [autonomy, relatedness, competency]→rumination facets [problem-focused thoughts, counterfactual thinking, repetitive thinking, anticipatory thoughts]→e-cigarette use frequency and dependence outcomes) among 1001 college students (75.3% female; 60.4% White, non-Hispanic; 52% first-year students) who endorsed past-month e-cigarette use. <i>Results</i>: Within our path model, we found significant indirect effects via problem-focused thoughts on e-cigarette use frequency and e-cigarette dependence. Specifically, higher scores on SDT autonomy, competence, and relatedness frustration were associated with greater problem-focused thoughts, which was associated with higher e-cigarette use frequency and e-cigarette dependence scores. <i>Conclusions/Importance</i>: Results highlight the importance of distinguishing between the unique facets of rumination in understanding relations with e-cigarette use. Further intervention research targeting need frustration and ruminative thinking (particularly problem-focused thoughts) among college student e-cigarette-dependent users is needed.