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===|| HOME || CAUSE || EFFECTS || TREATMENT|| PREVENTION || CHOICE || NOTES || MLA ||=== There are four main factors that can cause lung cancer.


 * 1: Smoking**

Smoking is the number 1 cause of lung cancer. Scientists have been researching how smoking can affect the lung for a long time. It has been found that approximately 90% of all lung cancer is from smoking. If you smoke, than the risk of you getting lung cancer is a lot higher than people who don't smoke. Smoking causes lung cancer because it contains over 4000 carcinogenic chemical materials, which means it contains chemical materials that are cancer causing. Second hand smoking can also raise the percentage of getting lung cancer. It has been found that people who live near smokers all the time have 24% more chance to get lung cancer.


 * 2: Radon Gas**

Radon gas is a natural occuring radioactive. It can be found in your homes. Constant exposure to a lot of radon gas can raise the risk of getting lung cancer. Also, Radon Gas causes around 10 % of all cancer.


 * 3. Exposure to certain chemical materials**

If you are exposed to certain chemical materials a lot, this can increase the risk of lung cancer. These certain chemical materials include asbestos, metal dust, and fumes. These materials can all increase the risk of getting lung cancer.


 * 4. Pollution**

Pollution can also cause lung cancer. Just like you feeling difficult to run long distances in places where the air is bad, pollution affects your lungs and makes it harder for you to breathe. Long exposure to pollution can increase the risk of getting lung cancer by up to 47%. smoking is the number one cause of lung cancer

QUIZ: List the 4 main factors that can cause lung cancer.