Sample characteristic, belief about the harm of secondhand smoke (SHS) of the ITC China baseline respondents
| Smokers | Non-smokers | |
| No (%) | No (%) | |
| City | ||
| Beijing | 804 (16.7) | 219 (17.2) |
| Shenyang | 801 (16.6) | 200 (15.8) |
| Shanghai | 801 (16.6) | 204 (16.1) |
| Changsha | 803 (16.7) | 205 (16.1) |
| Guangzhou | 804 (16.7) | 227 (17.9) |
| Yinchuan | 802 (16.7) | 215 (16.9) |
| Gender | ||
| Male | 4570 (94.9) | 528 (41.6) |
| Female | 245 (5.1) | 742 (58.4) |
| Age (years) | ||
| 18–34 | 473 (9.9) | 201 (15.9) |
| 35–44 | 1162 (24.2) | 264 (20.8) |
| 45–54 | 1648 (34.3) | 355 (28.0) |
| 55 or older | 1519 (31.6) | 448 (35.3) |
| Ethnic group | ||
| Han | 4575 (95.0) | 1192 (93.9) |
| Others | 240 (5.0) | 78 (6.1) |
| Highest education | ||
| Low | 629 (13.1) | 152 (12.0) |
| Middle | 3147 (65.5) | 752 (59.2) |
| High | 1032 (21.5) | 366 (28.8) |
| Household income | ||
| Low | 942 (19.6) | 238 (19.0) |
| Middle | 2158 (44.9) | 595 (47.6) |
| High | 1361 (28.3) | 343 (27.4) |
| Don’t know | 350 (7.3) | 75 (6.0) |
| Believe smoking causes lung cancer in non-smokers from SHS | ||
| No/don’t know | 2231 (46.4) | 236 (18.6) |
| Yes | 2577 (53.6) | 1032 (81.4) |
| Total | 4815 | 1270 |
Numbers are unweighted results.