Background: With 316 million smokers, China is the world's largest tobacco consumer.Adolescent smoking rates are increasing among females, and remain at a high level among males. Reducing smoking behaviour and associated cognitions in this transitional period is important to curb smoking in early adulthood.Objective: There were two objectives in this PhD: (i) to explore the psychological mechanisms underlying Chinese adolescents' smoking behaviour (Study 1); and (ii) to develop, implement, and evaluate a school-based smoking intervention among Chinese adolescents (Study 2). The latter objective was based on the former.Design: Mixed approaches were utilised. Study 1 used semi-structured focus groups based on the Theory of Planned Behaviour (TPB) among high school students. Following the Consensual Qualitative Research (CQR) methods, data were coded into seven domains.Based on the findings in Study 1, a belief-driven smoking programme ("Achieve my healthy future") was designed, and incorporated life skills training. After the implementation of the programme, smoking behaviour, associated cognitions, and skills were evaluated in a longitudinal design (3 time-points). Study 2 also included a qualitative study of the perceptions of school-based tobacco management among high school students and teaching staff members, using focus groups and interviews.Setting: Two middle schools in Kunming, Yunnan Province, China (February -October 2016).
Participants: Thirty 10th graders in Study 1 (50% female and 50% male); 207 10 th graders enrolled in Study 2 (106 in the intervention group; 101 in the control group).ii Measurements: Two qualitative studies and one quantitative study were included. For the elicitation study (Study 1), focus groups was used. For the qualitative study (Study 2), smoking behaviour, associated cognitions (intention, attitude, subjective norm, perceived behavioural control, willingness, prototype), and life skills (stress coping, decision making, assertiveness, pragmatics, dispositions towards critical thinking) were tested. For the perception study (Study 2), mixed data from focus groups, interviews, and field observations were used.Intervention: Based on the findings of Study 1, a four-session classroom-based intervention was designed. The programme focused on psychological constructs (attitude, subjective norm, perceived behavioural control, and prototype) as well as life skills (stress coping, decision making, assertiveness and pragmatics, and critical thinking). Each session lasted for 40 minutes.Key findings: (i) Study 1 identified seven domains, namely, advantages, disadvantages, approvers, disapprovers, facilitators, barriers, and smoker images. Smoking as a gendered behaviour, smoking as influenced by cultural and environmental contexts, smoking as a strategy to cope with stress, and awareness of the harm of smoking, are highlighted themes across domains. Based on the elicited beliefs, a smoking intervention programme was designed. Study 2 showed that (ii) the pilot intervention based o...