Participants will be invited to recall their smoking status and experience during their wife's pregnancy (all participants and required to complete the questionnaire, and some of them will be invited to participate in semi-structured interviews).~In the quantitative study,participants need to finish the questionnaire,which includes the demographic information sheet, characteristics of smoking sheet, history of smoking cessation sheet, smoking hazard questionnaire, motivation to quit smoking sheet, ability to quit smoking sheet, alcohol consumption, exercise.~In the qualitative study,participants need to participate in semi-structured interview.The interview begins with Have you tried smoking cessation before? Why? What is the result, and explores in-depth analysis based on the participants' answers.
The purpose of this study is to describe the relapse rate and characteristics of expectant fathers who quit smoking during their wives' pregnancy, to explore the influencing factors and triggering mechanisms,and describe their experience.