Lung cancer - Causes


Lung cancer is strongly associated with cigarette smoking, 90% of lung cancer occur as a result of smoking. The risk of lung cancer developing in a smoker is 15-25 times more than for a non-smoker. Passive smoking can increase the risk of developing lung cancer by about 30%.

Some other substances that increase lung cancer risk are:

  • Exposure to radon gas
  • Exposure to certain chemicals such as asbestos, coal gas, chromium, nickel, arsenic, vinyl chloride, and mustard gas
  • Air pollution
  • Previous lung disease
  • A family history of lung cancer
  • Past cancer treatment
  • Lowered immunity