Anatomy And Physiology For Health Professionals 2nd Edition by Jahangir Moini

تمرين 8

A 52-year-old man with no history of smoking was diagnosed with primary lung cancer. He worked in the human resources section of his local health department. His sister died 7 years previously from breast cancer. The patient's wife had a history of smoking two packs of cigarettes a day for 20 years.
How could this patient have contracted lung cancer without being a smoker?