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Perceived safer than tobacco cigarettes, prevalence of electronic cigarette (e-cigarette) use is increasing. Analyses of cartridges suggest that e-cigarettes may pose health risks. In light of increased use and the potential for consequences, we searched Google Scholar and Pubmed in July of 2013 using keywords, such as e-cigarette and vaping, to compare differences and similarities in prevalence and correlates of e-cigarette use among adolescents (grades 6–12) versus adults (aged ≥18 years). Twenty-one studies focused on e-cigarette use. Ever-use increased among various age groups. In 2011, ever-use was highest among young adults (college students and those aged 20–28; 4.9%–7.0%), followed by adults (aged ≥18; 0.6%–6.2%), and adolescents (grades 6–12 and aged 11–19; <1%–3.3%). However, in 2012 adolescent ever-use increased to 6.8% and, among high school students, went as high as 10.0 …