Int. J. Environ. Res. Public Health 2011, 8 1525 Table 2. Reported SHS Exposure at work in the past week by workplace smoking policy for current nonsmoking restaurant and bar owners in five Chinese cities, 2007. Restaurants Bars Smoking policy at work Smoking policy at work Days Exposed Prohibit Restrict Allow Total Prohibit Restrict Allow Total % (n) % (n) % (n) % (n) % (n) % (n) % (n) % (n) None 51.1 (24) 14.4 (16) 6.1 (13) 14.3 (53) 0.0 (0) 17.6 (3) 7.7 (2) 10.2 (5) 1–2 21.3 (10) 15.3 (17) 9.0 (19) 12.4 (46) 33.3 (2) 17.6 (3) 11.5 (3) 16.3 (8) 3–4 10.6 (5) 18.0 (20) 9.9 (21) 12.4 (46) 0.0 (0) 17.6 (3) 3.8 (1) 8.2 (4) 5–7 17.0 (8) 52.3 (58) 75.0 (159) 60.8 (225) 66.7 (4) 47.1 (8) 76.9 (20) 65.3 (32) Total 100.0 (47) 100.0 (111) 100.0 (212) 100.0 (370) 100.0 (6) 100.0 (17) 100.0 (26) 100.0 (49) Notes: Fifty current nonsmokers answered “Don’t know” and 53 current nonsmokers did not answer to the question about how many days they were exposed to SHS at work, and three others answered “Don’t know” to the question about the smoking policy at work, thus a total of 419 (370 + 49) rather than 525 current nonsmokers are included in this study. Results presented in this table represent simple aggregation of the survey results, and no sampling weighting was used. 3.2. Knowledge of Tobacco-Related Health Effects More than 95% of subjects believed that smoking or passive smoking was harmful to health, 75% knew that passive smoking could cause lung cancer, but only 61% believed that women with smoking husbands had higher risk to develop lung cancer. 72% believed that children with smoking parents were more likely to develop asthma or other respiratory disease and 51% knew that SHS could cause heart disease (Figure 1). Overall, 37% of the subjects answered all the six health-related questions correctly. Figure 1. Restaurant and bar owner and manager awareness of smoking-related health effects, five Chinese cities, 2007. Note: results presented in this figure represent simple aggregation of the survey results, and no sampling weighting was used.