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E-cigarette initiation and associated changes in smoking cessation and reduction: the Population Assessment of Tobacco and Health Study, 2013–2015
http://tobaccocontrol.bmj.com/content/early/2018/03/24/tobaccocontrol-2017-054108?rss=1
http://tobaccocontrol.bmj.com/content/early/2018/03/24/tobaccocontrol-2017-054108?rss=1