Introduction:
Thailand National Quitline (TNQ) has provided tobacco cessation via referral system by using electronic referral system the U-refer system. According to the previous studies, motivation to quit is a very crucial factor to stop smoking.

Objectives:
To investigate motivation to quit among smokers receiving proactive intensive counseling by the TNQ counselors after being referred through the U-refer system.

Methods:
Descriptive research was performed as a research design in this study. Study subjects were 344 smokers receiving proactive intensive counseling by the TNQ counselors after being referred through the U-refer system. Data were collected using interview questionnaire including, demographic data and the motivation to quit by the TNQ counselors from January to March 2019. Descriptive statistic was used to calculate the demographic data and the motivation to quit.

Results:
The findings revealed that majority of participants were male (88.37%). One-third of them were in middle adult age group, aged 36-55 years (37.32%), and elderly, aged 60 years and over (22.97%). For the reasons to stop smoking include as follows: 1) health problems (32.85%), 2) family concern (20.35%), 3) fear of health problems / fear of death (19.77%), 4) bad attitude toward smoking (13.37%) 5) wasteful / expensive cigarettes (9.59%) 6) awareness of the danger of tobacco from the media (2.62%), 7) smoking areas are reduced (0.87%), 8) teacher / supervisor ordered to quit (0.26%) and 9) colleagues / clients do not like (0.26%).

Conclusion(s):
The results illustrated the significant reasons to stop smoking include concerning over health consequences of smoking and aware of the hazard of tobacco in the family members. It is believed that current smokers with chronic diseases should be encouraged to stop smoking. Also, awareness of the effect of smoking tobacco in family member should be promoted to quit smoking.