210Po and 210Pb contained in cigarettes might contribute to an increase in an effective dose. This article reports the effective dose of radionuclides to smokers based on results of a review of various parameters related to dose estimation for smokers. The annual effective dose to smokers was found to be 0.27 mSv year−1, which was lower than an intervention exemption level (1 mSv year−1) given in International Commission on Radiological Protection (ICRP Publ. 82).