In the UK, lung cancer is known to be the greatest killer claiming around 36,000 lives each year. The principle risk factor of this disease is smoking. If there were no tobacco, lung cancer would have been a rare disease. Smoking and lung cancer are interrelated.

There are gases like carbon monoxide, and nitrogen oxides, as well as tiny solid particles containing tar in cigarette smoke which damage cells in the airways of the lungs. This damage can produce cells that grow uncontrollably and lead to cancer of the lungs and larynx.

The major risk factors are the number of cigarettes smoked, length of time smoked and the age. The amount of cigarettes one smokes is measured in pack years. One pack year is 20 cigarettes a day for one year. The lower threshold is five pack years over a lifetime, below which the risk of lung cancer is fairly less.Read more...

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