Lung and bronchus, colorectal, pancreatic and breast cancers account for about half of all cancer deaths. These are also the most common cancers in the United States, accounting for about 50% of all new cancer cases. Some other facts about these cancers are as follows. Lung cancer is the leading cause of cancer deaths worldwide. Smoking is the biggest cause of lung cancer. It causes about 90 percent of lung cancer cases. Tobacco smoke contains many chemicals that cause lung cancer. If you still smoke, quitting smoking is the best…
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