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Lung cancer is primarily caused by tobacco smoke, including secondhand smoke, but other factors like radon gas, occupational hazards, and genetics also play a role.
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While smoking is the leading cause, a significant percentage of lung cancer cases occur in individuals who have never smoked, highlighting the importance of addressing other risk factors.
Here's a more detailed breakdown:
1. Smoking:
- Cigarettes, cigars, and pipes: Tobacco smoke contains numerous carcinogens that damage lung cells, leading to cancer.
- Secondhand smoke: Breathing in smoke from others' tobacco use also increases the risk.
2. Radon Gas:
Naturally occurring gas:
Radon is a radioactive gas that can seep into buildings from the ground, and prolonged exposure increases lung cancer risk.
Second leading cause:
Radon exposure is the second leading cause of lung cancer in the United States, particularly among non-smokers.
3. Occupational Hazards:
Asbestos:
Exposure to asbestos fibers, often in older buildings or during construction, significantly increases lung cancer risk.
Other carcinogens:
Exposure to other substances like arsenic, diesel exhaust, certain organic chemicals, and silica can also contribute.
4. Air Pollution:
- Outdoor and indoor sources: Breathing polluted air, particularly in areas with high levels of industrial emissions or vehicle exhaust, can elevate lung cancer risk.
5. Genetic Factors and Family History:
Inherited predisposition:
A family history of lung cancer can increase an individual's risk, even in the absence of smoking or other known risk factors.
Multiple risk factors:
The risk is further increased if individuals with a family history also smoke or have other risk factors.
6. Other Factors:
Previous radiation therapy:
Radiation therapy to the chest for other cancers can slightly increase the risk of developing lung cancer.
HIV infection:
While smoking rates are higher in people with HIV, the virus itself may also contribute to increased lung cancer risk, according to MedlinePlus.
In summary: Lung cancer is a complex disease with multiple contributing factors.
While smoking remains the most significant cause, it's crucial to be aware of and mitigate other risk factors like radon exposure, occupational hazards, and genetic predisposition.
This is for informational purposes only. For medical advice or diagnosis, consult a professional. AI responses may include mistakes. Learn more
People also ask
What is the main cause of lung cancer?
Smoking. Smoking cigarettes is the single biggest risk factor for lung cancer. It's responsible for more than 7 out of 10 cases. Tobacco smoke contains more than 60 different toxic substances, which are known to be carcinogenic (cancer-producing).
What is 90% of cancer caused by?
Because 90% of cancer incidences stem from environmental or lifestyle factors, the vast majority of cancer incidences could be prevented with healthy lifestyle changes.
What causes lung cancer without smoking?
Lung cancer in people who don't smoke can be caused by exposure to radon, secondhand smoke, air pollution, or other factors. Workplace exposures to asbestos, diesel exhaust, or other chemicals can also cause lung cancers in some people who don't smoke. Some people with no known risk factors may develop lung cancer.
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