1. The anesthetic risk of tobacco smoking;Beckers;Acta Anaesthesiologica Belgica,1991
2. The effects of cigarette smoking on anesthesia;Rodrigo;Anesthesia Progress,2000
3. Pharmacological aspects of cigarette smoking and nicotine;Benowitz;New England Journal of Medicine,1988
4. CDC: tobacco use among adults-United States;Morbidity and Mortality Weekly Report,2005
5. 5 Available at: http://www.statistics.gov.uk/ssd/surveys/general-household-survey.asp.