6Breslau N, Peterson EL. Smoking cessation in young adults: age at ini- tiation of cigarette smoking and other suspected influences[J 1. Ameri- can Journal of Public Health, 1996,86(2) :214 220.
7Tessier JF, Freour P, Belougne D, et al. smoking habits and attitudes of medicall students towards smoking and anti - smoking campaigns in nine Asiaan countries[J]. Int J Epidemiol, 1992,21 (2) :298 - 304.
8McGhee SM, Ho LM, Chan J, et al. Cost of tobacco- related diseases, including passive smokingin Hong Kong[ J ]. Tobacco Control, 2006,15 (2) :125 - 130.
9Yin P,Jiang CQ,Cheng KK, et al. Passive smoking extx~sure and risk of COPD among adults in China: the Guangzhou biobank cohort study ~JJ. Lancet,2007,370:751 - 757.
10Liu Y, Rao K, Sun Q, et al. Cigarette smoking and poverty in China [J ]. Social Science & Medicine, 2006,63 ( 11 ). 2784 - 2790.