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. 2018 Nov 20;28(6):629–635. doi: 10.1136/tobaccocontrol-2018-054446

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© Author(s) (or their employer(s)) 2019. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Monitoring the Future survey, prevaping (2004–2013) and postvaping (2014–2017), and last 30 days cigarette prevalence with linear trend for prevaping period. (A) 10th graders, (B) 12th graders, (C) ages 18–21 and (D) ages 22–24.