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The main cause of lung cancer is smoking tobacco. Over 4,000 toxic substances have been identified in cigarette smoke, 60 of which are probably carcinogenic. Two of the most significant chemicals are tar and benzene (polycyclic aromatic hydrocarbons).
Smoking.80–90% of lung cancers occur in people who smoke; the risk of a smoker developing lung cancer is 10 to 20 times greater than a non-smoker.
Passive smokers. Passive smokers also face an increased risk of developing lung cancer. Hence the importance of prohibiting smoking in public places.
Occupational risk factors. Like mining, insulation materials and the textile industry,...include exposure to asbestos, nickel and radon.
Non-smokers. Non-smokers can also be diagnosed with lung cancer, representing up to 10% of all cases.
Not a hereditary. It is not a hereditary tumour but the risk may increase if your family history includes several incidences of lung cancer.