It is widely known that smoking is harmful to health, the environment and society and causes economic losses. Smoking is recognized as a crucial problem in public health because it causes deaths and diseases. Campaigns for cigarette consumption control have been raised by various organizations. Consequently, these efforts have produced a trend in smoking reduction. However, there are still a huge number of smokers who have failed in attempts to quit smoking . This study aimed to explore factors that influence success in quitting smoking among Thai smokers. Data in the study was from the Project on “Impacts of the Policy on Tobacco Consumption Control in Thailand”, Round 1 and Round 2. The sample group was composed of male and female smokers over the age of 18. A total of 1,558 smokers were interviewed. Logistic regression was used to analyze the data. The study reveals that age had an influence on success to quit smoking. For every extra year of age, there was an average 4 percent greater chance of quitting smoking. Heads of households had a 58 percent greater chance of success in quitting than those who were not heads of household. For every extra person in the household who was a smoker, there was a 98 percent greater chance of the person not successfully quitting. For every extra child in the household, there was a 37 percent greater chance of success. Finally, where the house had a smoking restricted area, there was nearly twice as much chance of success. To effectively control and prevent smoking, it is necessary for concerned parties to put the focus on impacts of smoking on health of children and family members. The importance of smoke free homes should be campaigned for and raised in a continual process. In addition to this, household heads should be targeted more.