Active and passive smoking and risk of breast cancer: a meta-analysis

  title={Active and passive smoking and risk of breast cancer: a meta-analysis},
  author={Alina Macacu and Philippe Autier and Mathieu Boniol and Peter Boyle},
  journal={Breast Cancer Research and Treatment},
Studies on active and passive tobacco smoking and breast cancer have found inconsistent results. A meta-analysis of observational studies on tobacco smoking and breast cancer occurrence was conducted based on systematic searches for studies with retrospective (case–control) and prospective (cohort) designs. Eligible studies were identified, and relative risk measurements were extracted for active and passive tobacco exposures. Random-effects meta-analyses were used to compute summary relative… 

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Passive and active smoking and breast cancer risk in Canada, 1994–97

Active and passive smoking may be associated with increased breast cancer risk, particularly premenopausal risk, and Statistically significant dose–response relationships were observed with increasing years of smoking, increasing pack-years and decreasing years since quitting.

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Smoking may not be associated with an increased risk of breast cancer in this cohort of Japanese women, and passive smoking at home or in public spaces was also not associated with a increased risk with nonsmokers.

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