Cancer - 2 Answers
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1 :
The relationship is that cigarette smoke has about 60 known, proven carcinogens. Every 16 or so cigarettes (on average) causes damage to the lung cells' DNA. Eventually you have damaged so many cells in so many locations, that a lung cancer is able to develop. Perhaps 15% of smokers will get lung cancer. Many more will get other chronic (and acute) respiratory and circulatory illnesses directly as a result of smoking. About 90% of lung cancer cases are caused by cigarette smoking. It is the single most significant cause of fatal cancer in the world today.
2 :
There are compounds in cigarette smoke which can damage DNA in cells (carcinogens). Over time, the amount of damage to cells in the lungs builds up and eventually a cell malfunctions and instead of dividing normally like every other cell in your body, the DNA is damaged so that the cell divides out of control and doesn't self destruct. That is the beginning of cancer. Basically, smoking causes cells to change and become cancerous.
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