Smoking is the leading cause of lung cancer and one of the important reasons for cancers of the respiratory tract and upper digestive tract (lips, tongue, throat, esophagus). It also has a relationship of kidney and bladder cancer. The cancer is a chaotic proliferation of cells, causing a localized tumor soon spread in the rest of the body. Lead to death at the end of the day, and can be cured if diagnosed early.
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cancer and smoking