Cancer survivors have high risk of secondary cancer and diseases other than cancer. However, there are persistent smokers among them. This study aims to explore the tobacco use patterns and associated factors with current smoking among cancer survivors. Methods: The results of surveys and blood tests collected from the Korea Medical Institute (KMI) from 2007 through 2011 were used as data. The subjects of this study were 91,040 adults (59,132 men) aged 20-64, and they were divided into cancer

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... rvivor group (1,375 men, 671 women) and non-cancer counterparts according to their past history of cancer. Results: The current smoking rate of cancer survivors was lower than that of non-cancer survivors, but 33.53% of men and 2.53% of women among cancer survivors were still current smokers. In the cancer survivors, in men, the younger they were, the higher the risk of current smoking became (The odds ratio of smoking in those aged 20-39 to 51-64 was 2.47 while that of smoking in 40-50, 1.43); and that the odds ratio of smoking in persons in drinkers to non-drinkers, 2.80 (95% CI: 2.02-3.88). In women cancer survivors, the odds ratio of current smoking was 21.15 (95% CI: 2.72-164.35) in alcohol drinkers to non-drinkers. Conclusion: Young age in men and alcohol use in both men and women were important factors correlated with tobacco smoking among cancer survivors. Further research and policy is needed to support cancer survivors' smoking cessation and health promotion. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (https://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.