FILE - In this June 3, 2010 file photo, Dr. Steven Birnbaum works with a patient in a CT scanner at Southern New Hampshire Medical Center in Nashua, N.H. New lung cancer screening guidelines from three medical groups recommend annual scans but only for an older group of current or former heavy smokers. The advice applies only to those aged 55 to 74. The risks of screening younger or older smokers or nonsmokers outweigh any benefits, according to the guidelines published online Sunday, May 20, 2012, in the Journal of the American Medical Association. (AP Photo/Jim Cole, File)

Associated Press
FILE - In this June 3, 2010 file photo, Dr. Steven Birnbaum works with a patient in a CT scanner at Southern New Hampshire Medical Center in Nashua, N.H. New lung cancer screening guidelines from three medical groups recommend annual scans but only for an older group of current or former heavy smokers. The advice applies only to those aged 55 to 74. The risks of screening younger or older smokers or nonsmokers outweigh any benefits, according to the guidelines published online Sunday, May 20, 2012, in the Journal of the American Medical Association. (AP Photo/Jim Cole, File)
FILE - In this June 3, 2010 file photo, Dr. Steven Birnbaum works with a patient in a CT scanner at Southern New Hampshire Medical Center in Nashua, N.H. New lung cancer screening guidelines from three medical groups recommend annual scans but only for an older group of current or former heavy smokers. The advice applies only to those aged 55 to 74. The risks of screening younger or older smokers or nonsmokers outweigh any benefits, according to the guidelines published online Sunday, May 20, 2012, in the Journal of the American Medical Association. (AP Photo/Jim Cole, File)
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