Prevalence of e-cigarette only, cigarette only, and dual use in the past 30 days by demographic characteristics and lifestyle and well-being factors in the health eheart study, N = 39,747<sup>*</sup>.
<p>Prevalence of e-cigarette only, cigarette only, and dual use in the past 30 days by demographic characteristics and lifestyle and well-being factors in the health eheart study, N = 39,747<sup><a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0198681#t001fn001" target="_blank">*</a></sup>.</p