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Contributors All authors contributed to the drafting and revising of the work.
Funding This work was supported by funding from the Burroughs Wellcome Fund, Tobacco-Related Disease Research Program and Bloomberg Philanthropies.
Disclaimer The funders played 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; and decision to submit the manuscript for publication.
Competing interests JWA owns equity positions in Health Watcher and Good Analytics. ECL has received consulting fees from Health Watcher and Good Analytics. MD holds equity in Good Analytics and has received consulting fees from Bloomberg LP. TLC received fees from Good Analytics and holds equity in Data Science Solutions. JWA, JEC and MD are the creators of tobaccowatcher.org, a project of the Institute for Global Tobacco Control at the Johns Hopkins Bloomberg School of Public Health for the Bloomberg Philanthropies.
Provenance and peer review Not commissioned; internally peer reviewed.
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