• Drug Alcohol Depend · Feb 2018

    Performance of cigarette susceptibility index among e-cigarette and hookah users.

    • Jessica L Barrington-Trimis, Adam M Leventhal, Todd A Alonzo, Tess Boley Cruz, Robert Urman, Feifei Liu, Mary Ann Pentz, Jennifer B Unger, and Rob McConnell.
    • Department of Preventive Medicine, Keck School of Medicine University of Southern California, United States. Electronic address: jtrimis@usc.edu.
    • Drug Alcohol Depend. 2018 Feb 1; 183: 43-50.

    ObjectiveSusceptibility to cigarette smoking has been used since the mid-1990s as a measure to identify youth at risk of cigarette initiation. However, it is unclear how well this measure predicts future smoking among electronic (e-)cigarette or hookah users, or among those in tobacco-friendly social environments.MethodsWe used prospective data from the Southern California Children's Health Study to evaluate the performance (sensitivity, specificity, predictive value) of a composite index assessing susceptibility to smoking, and to evaluate whether performance of the measure differed by use of e-cigarettes or hookah, or immersion in a tobacco-friendly social environment. Susceptibility to cigarette smoking was measured in 11th/12th grade (2014) among never cigarette-smokers (N=1266); follow-up data on smoking initiation were obtained approximately 16 months later.ResultsOverall, 16.4% of youth initiated smoking between baseline and follow-up. The sensitivity of the susceptibility to smoking index was low (46.4%), and specificity was high (79.0%). No difference in sensitivity was observed by baseline e-cigarette use; specificity was higher among never e- cigarette users. Differences in negative predictive value (NPV) and positive predictive value (PPV) were also observed by baseline e-cigarette and hookah use. Specificity was generally lower, and sensitivity was generally higher for those in tobacco-friendly social environments.ConclusionsOur findings suggest that use of the susceptibility to smoking index in cross-sectional studies of older adolescents to identify those likely to begin smoking may be inappropriate for those using alternative tobacco products (e.g., e-cigarettes or hookah).Copyright © 2017 Elsevier B.V. All rights reserved.

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