What is the role of smoking in the etiology of breast cancer?

Updated: Dec 26, 2019
  • Author: Graham A Colditz, MD, DrPH; Chief Editor: Chandandeep Nagi, MD  more...
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The relationship between active cigarette smoking and risk of breast cancer has been extensively evaluated in both case-control and cohort studies; collectively, the data provide strong evidence against any major overall relationship, as the 2004 Report of the US Surgeon General concluded the data suggest no causal relationship between active smoking and breast cancer. The question of passive or secondhand smoke exposure and risk of breast cancer was extensively reviewed in the 2006 report of the Surgeon General. [85] After thorough evaluation of the many epidemiologic studies, the report concluded that the overall evidence is mixed and does not strongly or consistently support a causal relationship between secondhand smoke and breast cancer.

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