An article by journal Archives of Internal Medicine reported that smokers before giving birth can be linked to an increased risk of breast cancer.
Lead researcher Fei Xue and colleagues from Brigham and women's Hospital and Harvard Medical School, examined the records of 111,140 women since 1976 and 2006 for active smoking. Have compared the data to that of females that were 36,017 passive smokers, this means that they were exposed to secondhand smoke.
During the study period, were reported a total of 8,772 cases of breast cancer. The disease was more prevalent among those who have had a higher frequency of past and current smoking, and having used cigarettes for a long time.
"Smoking before menopause was positively associated with the risk of breast cancer, and there were suggestions from our results that smoking after menopause may be associated with a risk of breast cancer slightly decreased," the authors wrote.
On the contrary, women who both smoke or were exposed to secondhand smoke does not seem to have an increased risk of breast cancer.
According to BreastCancer.org, an estimated 1 in 8 women will develop the disease in his lifetime.