Alcohol, especially if you are a regular drinker, can put you at risk. It is far more harmful in terms of cancer to females than to males. Alcohol makes you prone to mouth cancer, pharyngeal and laryngeal cancer. It can contribute to esophageal, colorectal and breast cancer. The regular recommended intake for alcohol is far less for women than for men. You can use measures to count how many units of alcohol are present in any given alcoholic drink.

Smoking is another reason for the occurrence of cancer and is a major risk factor for lung cancer. Around 90% of lung cancers develop from smoking and result in 30% of all deaths of cancer patients. If you can quit smoking, you will greatly reduce your risk for developing this type of cancer.
The sun is, believe it or not, another source for cancer. Overexposure to the sun's rays can cause melanoma, which is a form of skin cancer. It's important that you protect yourself from overexposure to the sun. Use a sun block if you need to be out in the sun. The sun block should be set a protection factor of 15 at the minimum. Also avoid being out in the sun during the midday when the sun is at its peak. Now, you do need sunlight for the production of vitamin D in the body, but if you limit your exposure to the morning hours then you will be doing fine.