Footnotes

• Twitter @owackowski

• Contributors SKG and OG contributed to paper writing and editing. EMT, JLP, CDD and OAW contributed to paper editing.

• Funding Funding for SKG, OG, ET, JLP, CDD and OAW was provided by NCI and Food and Drug Administration (FDA) Center for Tobacco Products (under U54CA229973). OG was also supported in part by the Rutgers Cancer Institute of New Jersey (under P30CA07270-5931). The content is solely the responsibility of the authors and does not necessarily represent the views of the National Institutes of Health or FDA.

• Competing interests JLP is a paid expert witness for the plaintiffs in a multidistrict litigation involving Natural American Spirit cigarettes.

• Provenance and peer review Not commissioned; externally peer reviewed.