New Delhi, Jan 13 (ANI): According to the World Health Organization (WHO), 7.6 million deaths globally each year are caused by cancer and data shows that lung cancer is by far the number one cancer killer. But how to know that you are developing signs of lung cancer? Lung cancer is the uncontrolled growth of abnormal cells that start off in one or both lungs, usually in the cells that line the air passages. The abnormal cells do not develop into healthy lung tissue, they divide rapidly and form tumors.
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