The scientists also found a link between chemical hair straighteners and breast cancer. Black and white women who used the straighteners every five to eight weeks were about 30% more likely to develop breast cancer. Although the risk was the same, the study pointed out, African American women are more likely to use chemical straighteners.
“We are exposed to many things that could potentially contribute to breast cancer, and it is unlikely that any single factor explains a woman’s risk,” said Dale Sandler, chief of the NIEHS Epidemiology Branch and co-author of the study. “While it is too early to make a firm recommendation, avoiding these chemicals might be one more thing women can do to reduce their risk of breast cancer.”