The last people you'd expect to see smoking may be among the most likely to develop lung cancer. Researchers at the Centers for Disease Control found that asthma sufferers are at an increased risk of lung cancer. In a 10-year study of 9,000 people, having asthma doubled lung-cancer risk -- regardless of other risk factors, like secondhand smoke. Asthma may cause inflammation that damages lung DNA. Have asthma? Drink white grapefruit juice; it contains naringin, which lowers the risk of lung cancer by up to 50 percent.
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