Perceived relative harm of using e‐cigarettes predicts future product switching among US adult cigarette and e‐cigarette dual users

US adult dual users of e-cigarettes and cigarettes who perceive e-cigarettes as less harmful than cigarettes appear 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 harm.