Top Cancer News reports that asthma sufferers are at an increased risk for lung cancer, regardless of other risk factors such as smoking or even secondhand smoke. In their 10-year Center for Disease Control study of 9,000 people, it was discovered that having asthma doubled the risk of developing lung cancer. It appears as though asthma may cause inflammation that damages lung DNA, and this places an asthmatic at a higher risk for lung cancer. See our article Chronic Inflammation & Chronic Disease for more information on inflammation, the link between asthma and cancer.

If you have asthma (or even if you don't), you may want to consider drinking white grapefruit juice. Other studies have shown that the high concentration of naringin in this citrus beverage can lower the risk of lung cancer by as much as 50 percent.