[Studies on relationship between passive smoking and lung cancer in non-smoking women]

A population-based case-control study was conducted in Beijing, as part of Sino-Monica Project, to explore etiology of lung cancer in non-smoking women. Results showed that there was certain association between passive smoking and lung cancer in non-smoking women, with an OR of 2.52, P < 0.05, and its strength also increased with cigarette-years of smoking. A statistically significant risk of lung cancer was observed in non-smoking women, as their passive cigarette-years accumulated to more than 200. Adenocarcinoma of the lung was more possibly induced by environmental tobacco smoke (ETS) (OR = 2.32, P < 0.05), and it seemed to have little relation between ETS and squamous lung cancer (OR = 1.04, P < 0.05).