There is a small amount of radiation in a CT scan. For all medical procedures, it is important to weigh the pros and cons to be sure each decision is right for you. There is a special scan dedicated to lung cancer screening which is even lower than usual chest CT scans. The radiation is monitored to be sure it is as low as possible to still get good images. It is generally accepted that the ‘pros’ of finding lung cancer early with a CT scan far outweigh the ‘cons’.