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Contributors AC, CCA and NDF designed the study; EV, BG, EL, BAD, CCA and NDF analysed and interpreted the data; EV and NDF drafted the manuscript; BG, EL, AC, BAD and CCA critically reviewed the manuscript; all authors gave final approval on the manuscript.
Funding This study was supported by funds from the Intramural Research Program of the NCI and the Tobacco Regulatory Science Program through the NIH and FDA.
Competing interests None declared.
Ethics approval Research Ethics Review Board of the National Center for Health Statistics, Centers for Disease Control and Prevention.
Provenance and peer review Not commissioned; externally peer reviewed.