Int. J. Environ. Res. Public Health 2011, 8 1533 16. National Bureau of Statistics of China. China Statistic Year Book 2007; National Bureau of Statistics of China: Beijing, China, 2007; Available online: http://www.stats.gov.cn/tjsj/ndsj/ 2007/indexee.htm (accessed on 11 October 2010). 17. Liu, R.; Yang, Y.; Travers, M.; Fong, G.T.; O’Connor, R.J.; Hyland, A.; Li, L.; Nan, Y.; Feng, G.; Li, Q.; et al. A cross-sectional study on levels of second-hand smoke in restaurants and bars in five cities in China. Tob. Control 2010, 19, i24-i29. 18. Yang, Y.; Jiang, Y.; Wu, X.; Feng, G. Analysis of policies on banning smoking in public places and their implementation in China. Chin. J. Health Edu. 2008, 24, 657-660. 19. National Bureau of Statistics of China. China Labour Statistical Yearbook 2006; National Bureau of Statistics of China: Beijing, China, 2006; Available online: http://www.stats.gov.cn/tjsj/ndsj/ laodong/2006/2006laodong.htm (accessed on 2 May 2011). 20. Liu, R.; Yang, Y.; Liu, X.; Chang, A.; Gong, J.; Zhao, B.; Liu, T.; Jiang, Y.; Hyland, A.; Li, Q. Knowledge and attitudes towards secondhand smoke among hospitality patronage in five cities in China. Chin. J. Epidemiol. 2008, 29, 421-425. 21. Fong, G.T.; Hammond, D.; Jiang, Y.A.; Li, Q.A.; Quah, A.C.K.; Driezen, P.; Yan, M. Perceptions of tobacco health warnings in China compared with picture and text-only health warnings from other countries: An experimental study. Tob. Control 2010, 19, i69-i77. 22. ASHRAE. ASHRAE Position Document on Environmental Tobacco Smoke; American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc: Atlanta, GA, USA, 2008. 23. Hyland, A.; Vena, C.; Cummings, M.K. A review of the economic effect of smoke-free restaurant and bar policies on the hospitality economy. Epidemiology 2000, 11, S145. 24. Ma, S.J.; Hoang, M.A.; Samet, J.M.; Wang, J.F.; Mei, C.Z.; Xu, X.F.; Stillman, F.A. Myths and attitudes that sustain smoking in China. J. Health Commun. 2008, 13, 654-666. © 2011 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).