Table 1.

The distribution of message content according to topic during the intervention [49]

Main topic	Subtitles	Number of messagesa
Before the quit day (Having a plan of action)	Controlling the stimulus for smoking	1
	Having a plan of action	2
	Suggesting the healthy behavior	1
	Things to do before the quit day	2
	Individual support from others	1
	Total	7 (Daily)
After the quit day (Preventing relapse)	Importance of self-rewarding	4
	Strategies to cope with nicotine withdrawal	13
	Coping with stimuli for smoking	13
	Changing the environment	10
	Preventing relapse	13
	Total	53 (First month, daily; Second month, every other day; Third month, every 3 days)

^aEach message may contain more than one topic. The predominant topic has been used for classification