At present, population-based cancer registries are not well established nationwide in China, and epidemiologic data for cancer are limited at the province level. Using data collected between 1988 and 2005 from 10 cancer registries, Chen et al6 investigated lung cancer incidence rates in Beijing; Shanghai; Wuhan, Hubei; Harbin, Helongjiang; Cixian, Hebei; Qidong, Jiangsu; Jiashan, Zhejiang; Futuo, Guangxi; ChangLe, Fujian; and Linzhou, Henan. In 2005, the crude incidence rate was 49.35 per 100,000 population (63.7 per 100,000 men and 35.0 per 100,000 women) in these areas. The total new cases of lung cancer were 536,407, of which 264,249 were from urban areas (182,173 men and 82,076 women) and 272,158 were from rural areas (189,020 men and 83,138 women),6 whereas an estimated 172,570 new cases of lung cancer in the United States were expected in the same year.1 Lung cancer incidence rates in women increased faster than that in men, with an average annual increase of 1.63% from 1988 to 2005 (1.3% in men and 2.34% in women) (Fig 2). However, the rate of lung cancer in women has begun to decrease after a long period of increase in the United States.1 There were regional variations in the incidence of lung cancer across the China.8 According to a cross-sectional study in 2000, people living in eastern China, particularly women, had a higher lung cancer risk than those living in western China, and people living in urban areas had a higher risk than those living in rural areas.9 In Tianjin, lung cancer was the most common cancer in women. The age-adjusted incidence rates in men and women, respectively, were 56.1 and 18.2 per 100,000 in Shanghai; 55.9 and 37.0 per 100,000 in Tianjin, and 35.0 and 11.0 per 100,000 in Qidong, an eastern rural area in China.