Certain cancers can be avoided, although there can be multiple factors that contribute towards a cancerous growth. For example, mouth cancer that mostly happens due to tobacco consumption can be avoided by reducing the intake of tobacco or by completely avoiding it. Many instances of lung cancer can be avoided by quitting smoking. Excessive exposure to sun can trigger skin cancer especially if the person is fair skinned. You can reduce weight and exercise often to get rid of toxins from the body. Eat healthy food. Make sure you don’t expose yourself to radiation. Make sure you don’t drink water with arsenic.