Table 1.

Semi-structured interview guide.

Categories	Interview Questions
Entry question	1.When you hear “lung cancer” or “lung cancer screening”, what comes to your mind?
Perceived susceptibility	2.Who get lung cancer? Do you think that you will get lung cancer? Why do you think like that?
Perceived severity	3.Do you know anybody who get lung cancer?
	PROBE:	(If yes) How does that impact their life? What if it happened in your case? (If no) What impact do you think it will be on a person's life, if he/she diagnosed with lung cancer? Why do you think like that?
Perceived benefits	4.Did your doctor or other health care providers discuss lung cancer or recommend lung cancer screening with/to you?
	PROBE:	(If yes) How do you/they benefit from screening lung cancer? (If no) What benefits do you think a smoker can get from screening lung cancer? Why do you think like this?
Perceived barriers	5.Further probe questions for question 4.
	PROBE:		(If yes) Tell me more about the difficulties that you/they encountered or what you think could be improved in the screening processes. (If no) What could be reasons for you not having a lung cancer screening? What help do you think is necessary for you to obtain lung cancer screening?
	6.What do you think may prevent a smoker from screening lung cancer? Why do you think so?
Self-efficacy	7.Do you know where and how to screen lung cancer?
	PROBE:		(If yes) Tell me more about the places and procedures for screening lung cancer. (If no) What could be done to make that information more accessible to smokers like you?
	8.Are you confident to schedule an appointment for screening lung cancer by yourself, if it is necessary?
	PROBE:	(If yes) Tell me more about the processes to schedule the appointment. (If no) What could be done by you or health care providers to make it feasible?
	9.Are you confident to discuss results of lung cancer screening with your doctor?
	PROBE:	(If yes) Tell me more about your interpretation of the screening results. (If no) What could be improved to make it feasible?
Cues to action	10.Did you get any information on lung cancer screening before?
	PROBE:	(If yes) Where did you get the information? How do you feel when you got that information? (If no) Who do you want to get the information from? What do you like to know most?
	11.What could trigger a smoker to decide to screen lung cancer? Why do you think so?
Ending Question	12.Is there anything that you think I should know about your perceptions or experiences about lung cancer or screening?