Van der Meer RM, Wagena EJ, Ostelo RWJG, Jacobs JE, van Schayck CP. 2001. Smoking cessation for chronic obstructive pulmonary disease. Cochrane Collaboration. Cochrane Library, Issue 1. Oxford: Update Software.
Velicer WF, DiClemente CC, Prochaska JO, Abrams DB, Emmons KM, Pierce JP. 1995. Distribution of smokers by stage in three representative samples. Preventive Medicine 24, 401-411.
Wagner EH, Curry SJ, Grothaus L, Saunders KW, McBride CM. 1995. The impact of smoking and quitting on health care use. Archives of Internal Medicine 155, 1789-1795.
Warner KE, Hodgson TA, Carroll CE. 1999. Medical Costs of smoking in the United States: estimates, their validity, and their implications. Tobacco Control 8 (3), 290-300.
Warner KE, Slade J, Sweanor DT. 1997. The emerging market for long-term nicotine maintenance. Journal of the American Medical Association 278 (13), 1087-1092.
Warner KE, Mendez D, Smith DG. 2004. The financial implications of coverage of smoking cessation treatment by managed care organizations. Inquiry 41 (1), 57-69.
Wechsler H, Rigotti NA, Gledhill-Hoyt J, Lee H. 1998. Increased levels of cigarette use among college students. Journal of the American Medical Association 280 (19), 1673-1678.
West R, McNeill A, Raw M. 2000. National smoking cessation guidelines for health professionals: an update. Thorax 55, 987–999.
West R, DiMarino ME, Gitchell J, McNeill A. 2005. Impact of UK policy initiatives on use of medicines to aid smoking cessation. Tobacco Control 14 (3): 166-171.
Wetter DW, Kenford SL, Smith SS, Fiore MC, Jorenby DE, Baker TB. 1999. Gender differences in smoking cessation. Journal of Consulting and Clinical Psychology 67 (4), 555-562.
Wewers ME, Stillman FA, Hartman AM, Shopland, DR. 2003. Distribution of daily smokers by stage of change: current population survey results. Preventive Medicine 36 (6) 710-720.
Yong HH, Borland R, Siahpush M. 2005. Quitting-related beliefs, intentions, and motivations of older smokers in four countries: finding from the International Tobacco Control Policy Evaluation Survey. Addictive Behaviors 30 (4), 777-788.
Yudkin P, Hey K, Roberts S, Welch S, Murphy M, Walton R. 2003. Abstinence from smoking eight years after participation in randomised controlled trial of nicotine patch. British Medical Journal 327 (7405), 28-29
Zhu SH, Melcer T, Sun J, Rosbrook B, Pierce JP. 2000. Smoking cessation with and without assistance: a population-based analysis. American Journal of Preventive Medicine 18 (4), 305-311.
Zhu SH, Anderson CM, Tadeschi GJ, Rosbrook B, Johnson CE, Byrd M, Gutierrez-Terrell E. 2002. Evidence of real-world effectiveness of a telephone quitline for smokers. New England Journal of Medicine 347 (14), 1087-1093.