The most common cause of lung cancer is smoking.
Smoking causes lung cancer because there are substances in tobacco that are known to cause cancer. These substances are known carcinogens (which means "carcinogens"), and it is the carcinogens that cause real damage to cells in the lungs. A cell that is damaged, it can become cancerous over time.
We can not predict which smokers are at increased risk of developing lung cancer. In general, however, the chances of a smoker developing cancer depends on:
Age a person started smoking
For how long a person has smoked
How many cigarettes per day a person smokes
Passive smoking - breathing other people's smoke - can also increase the risk of developing lung cancer.
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