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The most common causes of the lung cancer are smoking, active or passive,asbestos, radon, air pollution, genetic predisposition, chronic obstructivelung diseases, mesothelioma and prior history of lung cancer.


About 90% of lung cancer patients smoked. The risk is greater if the personsmoked for many years, using more packs of cigarettes. The studies have shownthat in the population of smokers who smoke 2 or more packs every day, everyseventh person is going to die because of the lung cancer. If someone smokes apack every day, his/hers risks of getting lung cancer are 25 times higher thannonsmokers’.

Other tobacco users (smoking cigars or pipe) are also at risk of gettinglung cancer. It is 5 times more likely they would develop the lung cancer thana person who doesn’t smoke.

Former smokers are also at greater risk of having this disease. It takes 15years to pass before their risk of having lung cancer becomes the same as atthe nonsmokers.

Actually, it is not tobacco that is the most dangerous compound in thecigarettes. Nitrosamines and polycyclic aromatic hydrocarbons, which arepresent in the tobacco smoke, are the substances that cause cancer.

Inhaling tobacco smoke (or passive smoking) at your work or at home is alsoproven to be an important risk factor. People living with a smoker have muchhigher chances of developing the lung cancer.


Asbestos fibers were used in the past for thermal and acoustic isolation.Even though that its use is limited and banned in the United States (US), somebuildings still have asbestos isolation. It is proven that the exposure toasbestos cause lung cancer and mesothelioma, and the risk is much higher insmokers exposed to asbestos.

Mesothelioma is a type of cancer, which affects the lining of the lungs,heart or abdominal cavity.


Radon gas is the residue product of uranium decay. This is an invisible gas,without the smell. It can travel through the ground and get into the house,causing the increased risk of lung cancer for everyone living in that home.Almost 12% of lung cancer deaths are associated with radon. The USEnvironmental Protective Agency (EPA) found out that 1 of 15 homes in the US contains radon.

Chronic Obstructive Pulmonary Disease (COPD)

These chronic illnesses are also connected with increased risk of lungcancer. The risk exist both, at smokers and non-smokers.

Air Pollution

Breathing the polluted air (contaminated from industry, power plants andcars) may be the cause of lung cancer. Studies reveal that air pollution hasthe effect similar to passive smoking.

Genetic Predisposition

Studies have shown that the predisposition for lung cancer could beinherited, regardless you smoke or not. If you had a relative with lung cancer,you have much higher chances of developing the illness yourself.

Lung Cancer

Patients who survived this disease have heightened risk of developinganother lung cancer.

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