Cancer occurring in people which are not using tabacoo and alcoholic substance what's the reason behind this?
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Tobacco and alcohol are causes of a few of many cancers. Only nails and hair don't get cancer. Rest all organs get cancers. The basic reason for a cancer is a genetic mutation that is defect in genes that either causes excess multiplication or prevent natural death of cells. Such an uncontrolled growth is cancer. Why these genetic mutations occur is difficult to decipher and no one cause can be blamed for it. But there are risk factors. Like no pregnancy or a delayed one is a risk factor for breast cancer. Infection by human papilloma virus can cause cancers of cervix, anal canal, oral cavity, etc. Exposure to radiation can cause cancers. Exposure to environmental toxins and uv rays from sun can cause cancers.
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