Persoskie A, et al. - In this longitudinal analyses of waves 2 (2014-15) and 3 (2015-16) of the prospective, national Population Assessment of Tobacco and Health Study, researchers ascertained whether perceiving e-cigarettes as less harmful than cigarettes anticipated if cigarette and e-cigarette dual users switched their product use status 1 year later, becoming exclusive e-cigarette users, exclusive cigarette smokers, or non-users of both product types. According to findings, US adult dual users of e-cigarettes and cigarettes perceiving e-cigarettes as less dangerous than cigarettes tend to be more likely to switch to exclusive e-cigarette use, more likely to remain dual users, and less likely to switch to exclusive cigarette use 1 year later than dual users with other perceptions of e-cigarette risk.