What Causes Lung Cancer Besides Smoking?

There is no doubt that smoking is the biggest cause of the lung cancer.But,its not necessary that only smokers get diagnosed with lung cancer.There are other factors also which can lead to the lung cancer are:
* passive smoking(inhaling tobacco smoke from the person who is smoking)
*Exposure to radon gas-it is a radioactive gas,formed during the decaying of uranium
*Exposure to asbestos material-the risk becomes 5 times more if the exposure is combined with cigarette smoking
*Air pollution
*Person with a family history of lung cancer
*Any other Previously occurred lung disease sustained for a long duration

Lack of physical activity and movement
Genetics
Unsafe sex
Environmental factors such as exposure to asbestos, a group of minerals found in housing and industrial building materials.
Sun exposure,e tc are common causes of cancer apart from tobacco and smoking.