health effects of radon
1 The primary adverse health effect associated with chronic exposure to radon is lung cancer (typically bronchogenic): - 2 squamous cell carcinoma. - 3 small cell carcinoma. - 4 adenocarcinoma. - 5 large cell carcinoma. 6  Other harmful respiratory effects associated with chronic exposure to radon include: 7  1.) emphysema. 8  2.) pulmonary fibrosis.