There is a direct link between food choices and 30 to 40 percent of cancers, according to the American Cancer Society (ACS). Choosing more vegetables, fruits and whole grains over animal fats may reduce the risk of colorectal, endometrial, esophageal, kidney, prostate, stomach and other cancers.

About one-third of all cancer deaths are attributed to use of tobacco products, according to the ACS. Smoking is responsible for about 87 percent of lung cancers and is associated with cancers of the mouth, pharynx, larynx, esophagus, pancreas, kidney and bladder.

The use of alcohol and recreational and illegal drugs weakens the body’s defense system. When the immune system is weakened, the body is less able to fight off disease, including cancer. For example, some studies have shown a connection between higher alcohol consumption and an increased risk of breast cancer. Alcohol is also a risk factor for cancers in other body areas, including the lungs, mouth, lips, colon, liver, esophagus and the larynx. Some research, however, has found that low to moderate consumption of red wine has cardiovascular and other health benefits, including reduced risk of prostate cancer, lung cancer and possibly other cancers. The association of alcohol consumption and cancer continues to be studied by researchers.