90 percent of lung cancer caused by smoking. In the non-smokers lung cancer Inertia about 30 percent as a result of the cigarette smoke of others. Studies have found that40 times, because the lungs are the organs that get the most smoke. The risk of harm of cigarette smoke is dependent on the amount of cigarettes smoked and the smoke inhalation. Early stage lung cancer have no symptoms.Symptoms include chronic cough, blood in sputum, weight loss, fatigue, fever, chest pain, which is a common symptom of many types of diseases often cause the patient to the doctor soon. And delayed diagnosis
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