What factors can cause lung cancer ？

Smoking can cause lung cancer is the main cause. The risk of suffering from lung cancer as the number of cigarettes by suction, time and type of increase. Use a filter or low-tar content of cigarettes, although a slight decrease in lung cancer may be the opportunity, but still much higher non-smokers. If a person stop smoking, he is suffering from a lung cancer risk significantly reduced in 15 years stopped breathing after he received the chance of lung cancer and non-smokers like. If other people inhaled the smoke emitted, which is second-hand smoke, also made with a slightly increased risk of lung cancer, especially if you live with people who are smokers. Nevertheless, the risk of developing lung cancer than your own smoking is still low. Although smoking cigarettes or cigars bucket of the people suffering from lung cancer risk than the absorption of man-made cigarettes low, but still higher than non-smokers have. Contact with certain chemical substances such as asbestos, uranium, Ming, nickel and so may be related to lung cancer, of course, these are extremely rare causes.
Air pollution are often suspected to be caused by one of the causes of lung cancer, but difficult to prove. All along, the men, especially men over the age of 40, with a higher risk of lung cancer. In recent years, more women joined the ranks of smoking, suffering from lung cancer of the female population is constantly increasing.
Recent research shows that in certain food found in a natural material, for some types of cancer, including lung cancer, has provided some protection. This substance called Yehong-(BetaCarotene), in the body into vitamin A. Ye Hong-exist in the red and yellow vegetables and fruits, especially carrots, but also exist in some green plants, such as spinach, broccoli. Although eat more vegetables useful, but the best protection or not to smoke.