Based on the National Lung Screening Trial (NLST), 55 to 74 year olds with a 30 pack-year smoking history who still smoke, or who had quit within the past 15 years, should consider low-dose CT scans to help screen for lung cancer. (Pack-years are a calculation made by multiplying the number of packs of cigarettes smoked daily by the number of years of smoking.) Check with your health plan for your coverage and places where the scan is available.
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