老李,今年48岁,每天坚持晨跑已有28年了,身体一直很好。可是最近,他总感觉胸部不适,喘气困难。后来在家人再三劝说下去了医院,经医生检查最后诊断为肺癌,全家人根本无法接受这样的事实。大家悲痛之余,不禁觉得奇怪,因为老李从不吸烟,怎么还会得肺癌呢?原来…… Lao Li, who is 48 years old, has been adhering to the morning run for 28 years. His body has been very good. But recently, he always felt chest discomfort and difficulty breathing. Later, when the family repeatedly tried to persuade him to go to the hospital, he was finally diagnosed with lung cancer by a doctor. The family could not accept this fact. In addition to grief, everyone feels weird because Lao Li never smoked. How could it get lung cancer?