BACKGROUND: Active smoking has little or no effect on women's risk of developing breast cancer, but it has been suggested that passive exposure to tobacco smoke may increase this risk among women who have never smoked. OBJECTIVE: To evaluate the possible relationship between passive smoking and breast cancer risk within the Million Women Study, a large UK prospective study, and to report a meta-analysis of published results. METHODS: In the large prospective study, 224 917 never smokers who c...Expand abstract
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Passive smoking and breast cancer in never smokers: prospective study and meta-analysis.
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