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. 2007 Oct 2;97(9):1287–1290. doi: 10.1038/sj.bjc.6604007

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Copyright © 2007 Cancer Research UK

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Relative risk of breast cancer for current smokers as compared to never smokers, by different characteristics. Black squares indicate odds ratios (ORs) area, which is proportional to the amount of information contributed (ie, to the inverse of the variance of the logarithm of the OR). Lines indicate 95% confidence intervals. All estimates were adjusted for age, age at first birth, recent body mass index and recent alcohol consumption when applicable. Recent denotes 1 year before data collection. (A) Women ever using menopausal hormone therapy excluded. (B) Current and past use defined as last use ⩽6 months and >6 months before diagnosis/pseudodiagnosis, respectively.