12 doctors weighed in:
Are cigarettes the only reason you get lung cancer?
12 doctors weighed in

Dr. David Cooke
Surgery - Thoracic
5 doctors agree
In brief: Major
The majority of lung cancer is caused by smoking 80-90%, especially in men.
There is growing incidence of lung cancer in never smokers (<100 total lifetime cigarettes). This may be caused by mutations in certain genes such as egfr, or unusual fusion genes such as eml4-alk. These gene mutations are often found in younger individuals, asian ethncity and never smokers.

In brief: Major
The majority of lung cancer is caused by smoking 80-90%, especially in men.
There is growing incidence of lung cancer in never smokers (<100 total lifetime cigarettes). This may be caused by mutations in certain genes such as egfr, or unusual fusion genes such as eml4-alk. These gene mutations are often found in younger individuals, asian ethncity and never smokers.
Dr. David Cooke
Dr. David Cooke
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1 comment
Dr. Stevan Cordas
In rare cases intrusion of radon daughters (breakdown products) can be a factor as well as asbestos and other occupational sources.
Dr. Carlo Hatem
Internal Medicine - Pulmonary Critical Care
3 doctors agree
In brief: No
Cigarettes are responsible for the overwhelming majority of lung cancers but is not the only cause.
Some other lung carcinogens include asbestos, cadmium, beryllium, chromium, arsenic, silica, nickel, radon, and diesel exhaust.

In brief: No
Cigarettes are responsible for the overwhelming majority of lung cancers but is not the only cause.
Some other lung carcinogens include asbestos, cadmium, beryllium, chromium, arsenic, silica, nickel, radon, and diesel exhaust.
Dr. Carlo Hatem
Dr. Carlo Hatem
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Dr. Gurmukh Singh
Pathology
2 doctors agree
In brief: Major reason
90% of the lung cancers occur in smokers.
Environmental pollutants, especially radon gas are also carcinogenic. About 10% of lung cancers occur in non-smokers.

In brief: Major reason
90% of the lung cancers occur in smokers.
Environmental pollutants, especially radon gas are also carcinogenic. About 10% of lung cancers occur in non-smokers.
Dr. Gurmukh Singh
Dr. Gurmukh Singh
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In brief: No
Non smokers also get lung cancer less frequently.

In brief: No
Non smokers also get lung cancer less frequently.
Dr. Addagada Rao
Dr. Addagada Rao
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