Press Release — Ahead of Radon Action Month in January, the North Carolina Department of Health and Human Services is releasing county-level data and resources on radon levels across the state. In North Carolina, radon is the number one environmental cause of lung cancer, and an estimated 480 residents die each year due to radon-induced lung cancer. Persons who have smoked at least 100 cigarettes in their lives are ten times more susceptible to the impacts of radon.