Based on a clinical trial by the National Cancer Institute, these screenings reduce lung cancer deaths by 20 percent compared to traditional chest X-rays. Ideal candidates are those 55-74 years old with a cigarette smoking history of at least 30 pack-years (one pack per day for a full year), and former smokers who have quit within the past 15 years. A physician order is required and the cost is just $199. Includes exam and radiologist interpretation fees.