Smoking damages healthy cells causing them to multiply profusely to induce lung cancer. As smoke reaches the lungs directly, the cancer-causing toxic particles affect them the most. Also affected are the mouth and oesophagus.
A study published on the website of National Library of Medicine has shown that smoke from a cigarette contains toxic particles like polycyclic aromatic hydrocarbon, N-nitrosamines, aromatic amines, 1,3-butadiene, benzene, aldehydes, and ethylene oxide which are known to cause lung cancer.
These toxic particles damage the inner lining of the lungs and change the genetic structure of the lung cells. Initially, the natural immune system may be able to repair the damage. However, if repair mechanisms fail, the damaged cells behave abnormally and quickly multiply. The natural immune system cannot keep up with the growth and the damaged abnormal cells accumulate and spread causing lung cancer.
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