Introduction:
Although the number of people attended the smoking cessation clinic was increasing, only 20 to 38 percent of them could quit. So the method is to find the other factors affecting patients’ motivation to quit.

Objectives:
To examine factors related to smoking cessation behavior among patients attending the smoking cessation clinic, Raman Hospital, Yala Province, Thailand.

Methods:
A Cross-Sectional study was performed by interviewing 226 patients who finished the 6-month follow-up at the smoking cessation clinic. Seven aspects were interviewed include physical factors, behavioral factors, environmental factors, psychological factors, cognitive factors, obstacles on accessibility to smoking cessation services and social context. Data were analyzed by comparing people who successfully quit with others.

Results:
Majorities of the sample were males, self-employed and married. Sample earned income more than 5000 baht per month has a higher probability of quit smoking than those with lower income. The causes of failure to quit smoking were curiosity and imitation. It was also found that their chronic disease has a significant relationship with smoking cessation behavior too. In addition, people who socialize weekly with smoking friends tended to quit smoking more than those staying with smoking individual(s). And the places with house or office smoking prohibited had a significant relationship with smoking cessation In addition, people who socializes with smoking friends once a week will have the tendency to quit smoking more than who stay with smoking person. In the same way, wherever has the rules of smoking in the home or office, there is a significant relationship with smoking cessation.

Conclusion(s):
Behavioral factors, environmental factors, and social context affect the success of quit smoking. The smoking cessation guidelines should be reviewed to help people by applying the mentioned factors such as modifying family activities, promoting smoke-free in the workplace or community, standardizing the smoking cessation clinic, expanding accessibility to the clinic, and increasing motivation with economic incentives after quitting.