Age of smoking initiation and risk of breast cancer in a sample of Ontario women
Erin Young 1,   Scott T. Leatherdale 1, 2, 3  
,   Margaret Sloan 2,   Nancy Kreiger 1, 2, 4,   Andriana Barisic 2
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Dalla Lana School of Public Health, University of Toronto, Toronto, Canada
Department of Population Studies and Surveillance, Cancer Care Ontario, Toronto, Canada
Department of Health Studies and Gerontology, University of Waterloo, Waterloo, Canada
Department of Nutritional Sciences, University of Toronto, Toronto, Canada
Publication date: 2010-02-17
Tobacco Induced Diseases 2009;5(February):4
To examine the association between time of smoking initiation and both the independent and joint effects of active and passive tobacco smoke exposure and the risk of breast cancer in a sample of Ontario women.

Data from two large population-based case-control studies conducted among Ontario women aged 25–75 years were combined for analysis (n = 12,768).

Women who had ever smoked and were exposed to passive smoke had a significant increased risk of breast cancer (OR 1.13, 95%CI 1.01–1.25). A significant increased risk was also observed among women who initiated smoking: at age 26 or older (OR 1.26, 95%CI 1.03–1.55); more than five years from menarche (OR 1.26, 95%CI 1.12–1.42); and, after their first live birth (OR 1.25, 95%CI 1.02–1.52).

The results suggest that women who initiate smoking at an older age are at an increased risk of breast cancer.

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