Stage 1: Systematic review
A mixed methods systematic review to understand the role of school-based social diffusion processes and their influence on adolescent smoking, with a particular focus on how these vary over time in line with the denormalisation of smoking, and by socioeconomic status.
Stage 2: Social network analysis
Social network analysis in the form of a survey for Year 10 students (age 14-15 years) in 20 schools to understand who they are friends with and how this links to their smoking behaviour.
Stage 3: Interviews
Qualitative interviews with students to achieve an in-depth understanding of the ways in which student interactions may lead to differing social diffusion processes for smoking within and between schools.
Stage 4: Integration of data
Integration of results from stages 1-3 using a cross-case analysis. Patterns and potential themes that may explain variation in social diffusion of smoking across different school contexts will be explored.