Abstract: Cigarette is the dangerous thing for health because very toxic, dangerous, and addictive. Based on a survey in the Antasan Senor Village, the number of active smokers reached 74, 84%. One of the efforts is created a method with direct mentoring for active smokers called petugas pengawas perokok method. A research is needed to explain the difference level knowledge, attitude, and behavior in smokers before and after the application of petugas pengawas perokok method. This study was analyzed using quantitative methods with pre- and post-test design through pre-experimental approach. The population of this study was 595 families, sample were 88 respondents was determined using Slovin formula. Instrument of this research using questionnaires and blanko stuffing. Treatment variables were petugas pengawas perokok method, while the dependent variable was level of knowledge, attitude, and behavior. The result showed before the implemented of petugas pengawas perokok method 57 respondents (64,8%) has a good knowledge, 57 respondents (64,8%) has a good attitude, 52 respondents (59,1%) has a good behavior. After the the implemented of petugas pengawas perokok method 72 respondents (81,8%) has a good knowledge, 65 respondents (73,9%) has a good attitude, 56 respondents (63,6%) has a good behavior. Based on Mc Nemar test, obtained the result there are differences level knowledge (p= 0,000) and attitude (p = 0,008) and there are no differences behavior (p=0,219) before and after implemented petugas pengawas perokok method. Needed more research to know effectiveness this method with more respondents, wider area, and more time. Keywords: level of knowledge, attitude, behavior, smoker, petugas pengawas perokok method