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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 a leading cause of death in Australia â more than 43,200 people died from cancer in 2011. The most common causes of cancer deaths are not necessarily the most frequently occurring cancers. While lung cancer is the fifth most common type of cancer overall, it is the leading cause of cancer death in Australians.he most common causes of cancer deaths are not necessarily the most frequently occurring cancers. While lung cancer is the fifth most common type of cancer overall, it is the leading cause of cancer death in Australians.