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While these symptoms may indicate cancer, they may have other causes. Over 100 types of cancers affect humans. Tobacco use is the cause of about 22% of cancer deaths. Another 10% is due to obesity, poor diet, lack of physical activity, and excessive drinking of alcohol. Other factors include certain infections, exposure to ionizing radiation and environmental pollutants.
Cancer is the number one killer in Travis County, and lung cancer is. the leading cause of cancer death among the cancers, with almost 90 percent of lung cancers due. directly to smoking. Lack of physical activity and poor nutrition are the other major causes of. these costly, preventable chronic diseases.