Material and Method: The FTND was translated into Thai. Afterward, participants completed the questionnaire two times, at baseline and seven days after. The intraclass correlation coefficient (ICC) and Cronbach’s alpha were calculated for the test-retest reliability and internal consistency, respectively.

Results: The average age of the 130 participants was 32.4 years, and 45.4% finished secondary education. Participants smoked an average of 11.0 cigarettes per day over an average period of 11.3 years. The ICC of FTND was 0.83. Cronbach’s alpha was 0.52.

Conclusion: Overall, the ICC and Cronbach’s alpha of the Thai version was close to the original version in English. Therefore, the Thai FTND could be used in the clinic and in research.

Keywords: The Fagerström Test for Nicotine Dependence, FTND, Nicotine dependence level, Reliability