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Contributors Concept and design: ECL; Acquisition, analysis or interpretation of data; drafting of the manuscript and critical revision of the manuscript for important intellectual content: All authors. Obtained funding: JA. Supervision: ECL.
Funding JWA, ECL and ALN were supported by grant 28KT-0004 from the Tobacco-Related Disease Research Programme. ALN was also supported by grant T32DA023356 from the National Institutes of Drug Abuse.
Competing interests JJP has provided consultation to pharmaceutical and technology companies that make medications and other treatments for quitting smoking and has served as an expert witness in lawsuits against the tobacco companies.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.