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Contributors CDD conceptualised the work, compiled the data and conducted the analyses. CDD, DPG and ACV interpreted the data, drafted the manuscript and provided critical revisions of the manuscript.
Funding CDD, ACV and DPG were supported by Tobacco Centres of Regulatory Science (award U54CA229973) from the National Cancer Institute (NCI) and Food and Drug Administration (FDA). DPG was also supported by the Office of the Director at the National Institutes of Health (DP5OD023064).
Disclaimer The content of this report is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health or the US FDA. The funder had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; or decision to submit the manuscript for publication.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.