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154. Measuring electronic cigarette exposure: A review of self-reported and biological assessments
Introduction: Research on electronic cigarettes (e-cigarettes) requires accurate characterization of patterns and levels of exposure. However, it is unclear whether assessments used in many e-cigarette studies capture actual levels or patterns of use. The current study systematically reviewed and quantified the e-cigarette literature to summarize how researchers have assessed patterns and levels of e-cigarette exposure, including, primarily, self-reported exposure, and, secondarily, biological markers of exposure. Methods: Studies of current e-cigarette users were eligible if the study was (a) conducted in a laboratory setting, (b) published in a peer-reviewed journal between 2007 and 2017, (c) published in English, (d) included some form of e-cigarette exposure assessment, and (e) included e-cigarette users. Of the 2,061 candidate studies that were identified, 40 met criteria for review. Results: At present, there has been almost no research establishing the validity of any self-report measures collected in the reviewed studies, and the published research rarely described any attempt to validate the assessments that were employed. Conclusions: The field would be aided considerably by greater attention to the psychometric properties of the assessments currently collected in e-cigarette research and, ultimately, the development of measures that accurately capture patterns and levels of e-cigarette exposure.