In this weeks’ Medical Discovery News by UTMB’s David Niesel and Norbert Herzog: The idea of third-hand smoke premiered in 2009, and scientific evidence shows that it, too, can harm human health. Third-hand smoke is the many toxic compounds from tobacco smoke that settle onto surfaces (particularly fabrics) such as carpet, furniture and the inside of a car. Researchers have identified chemicals in third-hand cigarette smoke called NNA and NNK that can bind to DNA, a person’s genetic information, and cause damage and mutations that could lead to cancer.