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"New to the suspected category are substances that form when meats are cooked or grilled at high temperatures. Studies suggest an increased cancer risk when foods containing them are eaten.

But "does that mean you have to throw out your barbecue grill?" asked Dr. Elizabeth Whelan, a critic of the list from the American Council on Science and Health, a consumer education group. She said the "not consumer friendly" list should include information on the types of exposures and dosages that cause cancer, as well as on the health benefits of some of the substances identified, such as tamoxifen, the breast cancer treatment pill. "