long term smoking and bc survival

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http://medicalxpress.com/news/2015-06-impact-survi...

"In a prospective study of 848 women with breast cancer who were followed for a median of 6.7 years, premenopausal women who smoked for more than 21.5 years had a 3.1-times higher risk of dying from any cause as well as a 3.4-times higher risk of dying from breast cancer. These links were not apparent among post-menopausal women...."

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