If you have any of these symptoms, talk to your doctor. A study in the U.K. found that the median time between the onset of symptoms and the time when people sought medical attention for lung cancer was 12 months. If you are a never smoker with these symptoms, don't dismiss the chance that it could be lung cancer, and get a second opinion if your doctor dismisses it. Lung cancer in non-smokers is the sixth leading cause of cancer deaths in the United States. If you are a smoker with these symptoms, don't hesitate to call your doctor. A 2016 study found that people who smoke are less likely to visit their doctors with warning signs of lung cancer than non-smokers. If you feel guilty about smoking, erase that guilt and make the appointment. Everyone—whether you have never smoked or have chain smoked throughout your life—deserves the best of care and treatment in facing lung cancer. If you have a history of smoking, talk to your doctor about lung cancer screening before you have any symptoms. Screening is recommended for people who: Are between the ages of 55 and 80, Smoke or smoked for a total of 30 pack-years, Continue to smoke or quit smoking in the past 15 years.