Author Contributions:Study concept and design: Batty. Acquisition of data: Batty and Shipley. Analysis and interpretation of data: Batty, Shipley, Kivimaki, Davey Smith, and West. Drafting of the manuscript: Batty, Davey Smith, and West. Critical revision of the manuscript for important intellectual content: Batty, Shipley, Kivimaki, Davey Smith, and West. Statistical analysis: Shipley, Davey Smith, and West. Obtained funding: Kivimaki. Study supervision: Batty.
Financial Disclosure: Dr West has undertaken research and consultancy for the following companies that develop and manufacture smoking cessation medication: Pfizer, GSK, J&J, Nabi, and Novartis. He also has a share of a patent for a novel nicotine delivery system.
Funding/Support: The original screening of the Whitehall study was funded by the Department of Health and Social Security and the Tobacco Research Council. Dr Batty is a Wellcome Trust Fellow; Mr Shipley is supported by the British Heart Foundation; and Dr Kivimaki is supported by the Academy of Finland (Finland) and the National Heart, Lung, and Blood Institute (R01HL036310) and the National Institute on Aging (R01AG034454), National Institutes of Health (United States).