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Contributors JPP, JWA and DRS obtained funding. ECL and DRS were responsible for data management and analysis. ECL had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis. All authors contributed to study design, data acquisition, data interpretation, manuscript preparation and the revision process and read and approved the final manuscript.
Funding Research reported in this publication was supported by 1R01CA190347-01 from the National Cancer Institute (ECL, DRS and JPP) and RCA173299A from the National Cancer Institute and FDA Center for Tobacco Products (JWA).
Competing interests None declared.
Ethics approval Westat's Institutional Review Board approved the PATH study design and protocol, the Office of Management and Budget approved the data collection and the University of California: San Diego's Institutional Review Board approved of the data analysis.
Provenance and peer review Not commissioned; externally peer reviewed.
Data sharing statement Access to the ‘Restricted Use File’ of the Population Assessment of Tobacco Use and Health can be obtained by completing the registration process: goo.gl/yL2Et6.