Asbestos exposure can cause the deadly cancer mesothelioma but a lesser-known mineral called erionite is even more potent than asbestos, and it’s completely unregulated. Erionite is found in rock formations in at least a dozen U.S. western states. Aubrey Miller, Senior Medical Advisor for the National Institute of Environmental Health Sciences, led a study on the health effects of erionite exposure. He tells host Bruce Gellerman about the dangers of the naturally occurring mineral and its public health implications.