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Contributors All authors contributed to editing and intellectual contributions to interpretation. MOC conceived the idea, conducted the analysis and drafted the letter. All authors contributed towards study design.
Funding This research was supported by the National Institute on Drug Abuse (NIDA) of the US National Institutes of Health (NIH) under Award Number P50DA036105 and the Center for Tobacco Products (CTP) of the US Food and Drug Administration (FDA) and the NIH Office of the Director under 1R21DA047358-01. The effort of TE, JEC and ES is also supported by NIDA and CTP/FDA under U54DA036105.
Disclaimer The content is solely the responsibility of the authors and does not necessarily represent the views of the NIH or the FDA.
Competing interests TE is a paid consultant in litigation against the tobacco industry and is named on a patent application for a device that measures the puffing behaviour of electronic cigarette users.
Provenance and peer review Not commissioned; externally peer reviewed.