Screening for lung cancer has been regarded as unwarranted for many years. With new techniques, this is no longer the case. Screening with low dose CT scanning has been used in Japan and New York, among many places, for a number of years. We here describe some results. New lung cancers were found in 0.6 per cent of all participants in both studies at the yearly repeat scan. The tumors have been very small, almost all in Stage I, and survival is very good. Thus, the results are promising, and trials in Sweden will hopefully begin before long.