Smoking is the greatest risk factor for developing lung cancer, with nearly nine out of 10 lung cancer cases occur due to smoking. The level of risk is affected by the length of time someone has smoked and also the quantity smoked. For example, if one has smoked 20 cigarettes per day for 40 years, he/ she is approximately eight times more likely to develop lung cancer than if he/ she smokes 40 cigarettes per day for 20 years.
Passive smoking is also a risk factor with a 25 per cent increase in the likelihood of developing lung cancer in spouses of smokers, while people who are exposed to smoke at work have an increased risk of about 17 per cent. So, please avoid smoking.
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