Charlie died of lung cancer which is more common in men who smoke. Smoking cigarettes greatly increases the risk of lung cancer, with male smokers of 1-2 packs a day facing a 15 times higher risk. The longer one smokes and the more they smoke each day, the higher the risk. Unfortunately, lung cancer symptoms often do not appear for many years, allowing the disease to progress to advanced stages by the time of diagnosis. Regular exercise and avoiding cigarette smoking from a young age could have prevented Charlie's lung cancer and allowed him to pursue his dream of becoming a district attorney.