Awareness, trial and use of heated tobacco products among adult cigarette smokers and e-cigarette users: findings from the 2018 ITC Four Country Smoking and Vaping Survey

Connor R Miller, Edward Sutanto, Danielle M Smith, Sara C Hitchman, Shannon Gravely, Hua H Yong, Ron Borland, Richard J O’Connor, K Michael Cummings, Geoffrey T Fong, Andrew Hyland, Anne C K Quah, Maciej L Goniewicz