Lung cancer causes

Although smoking is an undisputed cause of the occurrence of lung cancer, statistics show that between 10 and 15 percent of the people that develop this disease are nonsmokers.

In these circumstances it is natural to wonder what lung cancer causes are. Well, researchers have identified a series of genetic and environmental factors that increase the risk of getting sick of lung cancer without being a smoker.

A genetic legacy

numerous studies over time have shown that people whose relatives have suffered from lung cancer are more prone to this disease, whether or not smoking, compared with those whose family history does not include lung cancer.

Experts put this on behalf of genes, as confirmed recently by American researchers from the Mayo Clinic, in collaboration with people at Harvard and the University of California. They found that 30 percent of lung cancer patients that have never smoked had a variant of a gene that prevents the action of other genes with important role in inhibiting the development of cancerous tumors in the lungs.

Secondhand smoke

Studies show that a non-smoker living with a person who smokes has an increased risk by 24 percent to make this disease than other smokers.

This is because much of the smoke emitted by a lit cigarette which is not inhaled by the smoker is released into the atmosphere. This smoke contains twice as much nicotine, tar and carbon monoxide, which enters the lungs of the passive smoker.

Construction work

Asbestos is a compound used in the manufacture of building materials to strengthen them, making them resistant to fire or heat insulation. Studies on humans have shown that inhalation of large quantities of asbestos fibers is associated with lung cancer.

On the other hand, has shown that smokers who work in such an environment have a five times higher risk of developing the disease compared with nonsmokers not exposed to asbestos.



Exposure to the engine exhaust gas, petroleum products, arsenic and substances emitted to air from industrial buildings increase the likelihood of lung cancer.

Exposure to radon

Radon is a radioactive gas to action issued by the rocks and the earth’s crust. This gas can enter homes through cracks in floors and drainage pipes. Although there are areas where radon emanations are higher, it is found in all types of soil and rocks, and in some building materials derived from land, such as clay or granite. And research shows that prolonged exposure can lead to lung cancer.

Symptoms of lung cancer

Experts say that 80 percent of lung cancers are detected late, so the chances are that lung cancer treatment can be reduced. To diagnose lung cancer early, any symptom should be taken as a sign, especially if the person faces one of the situations described above. Persistent respiratory problems should be taken seriously and it is highly advisable to perform a series of investigations such as chest X-ray, sputum analysis, or CT (computed tomography).

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