These 10 studies are summarized narratively because sales/purchases and prevalence/frequency/other outcomes are not appropriate for direct comparison, even in a random-effects model, and because each combination of outcome (current use, daily use) and population (adults, adolescents) had too few results for separate model-based meta-analyses
Additionally, being married and having a college or undergraduate degree, as well as a Masters degree or higher, were associated with a higher percentage of e-cigarette use
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Australia, on the other hand, has adopted a highly restrictive, medicalized approach, designed primarily to deter youth vaping