Secondhand Smoke (cont.)
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Secondhand Smoke and Breast Cancer
Even though breast cancer rates are not known to be increased in active smokers, some research points to a possible effect of passive smoke on breast cancer development. Tobacco smoke does contain chemicals that have been shown to cause breast cancer in animal models. It is also known that chemicals from tobacco smoke are able to accumulate in breast tissue and breast milk. Whether secondhand smoke actually increases the risk of breast cancer has not been conclusively determined, but the U.S. Surgeon General's report concluded that there is "suggestive but not sufficient" evidence of a link in 2006.
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