Women may have yet another reason not to smoke.

In addition to causing lung cancer, heart attacks and strokes, a new study suggests that smoking also may slightly increase the risk of breast cancer.

Scientists have known for decades that tobacco causes lung cancer and at least nine other types of tumors, according to the National Center Institute. Worldwide, smoking kills 5.7 million people a year, according to the World Health Organization.

Twenty-one reusable bags sold as alternatives to disposable plastic or paper bags had dangerous levels of lead, according to new test results provided to USA TODAY.

The non-woven-polypropylene bags, sold by chains including Safeway, Walgreen’s and Bloom, all had lead content above 100 parts per million — the highest level that many states allow in consumer packaging. The tests were conducted by Frontier Global Sciences for the Center for Consumer Freedom (CCF), which plans to release the results Monday. The group tested 71 bags and inserts from 44 retailers and organizations.