The CDC team used retail scanner data from the 48 contiguous states and Washington to analyze sales and prices of e-cigarette products from 2012 to 2017
Nat Commun 4 , 1495 (2013)
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Further information This work was supported by Bloomberg Philanthropies through its funding for STOP, a global tobacco industry watchdog (www.bloomberg.org, www.exposetobacco.org), and by the UK Prevention Research Partnership (MR/S037519/1), which is funded by the British Heart Foundation, Cancer Research UK, Chief Scientist Office of the Scottish Government Health and Social Care Directorates, Engineering and Physical Sciences Research Council, Economic and Social Research Council, Health and Social Care Research and Development Division (Welsh Government), Medical Research Council, National Institute for Health Research, Natural Environment Research Council, Public Health Agency (Northern Ireland), The Health Foundation and Wellcome
The one difficulty with eCigs is that it's hard to know when you've had enough
