Increasing prevalence of vaping (e-cigarette use) among youth in Canada and elsewhere has become a serious public health concern. The Teens Talk Vaping project sought to co-produce research about teen vaping with teens to generate in-depth qualitative evidence about the everyday socio-environmental dimensions of teen vaping experiences and exposures across perspectives of both teens who vape and those who do not. Our participatory approach included a capacity-building programme to train teen team members to contribute to the project as ‘co-researchers’, equipping them with the research skills necessary to contribute to all phases of the project, from data collection through to knowledge translation. Paired with adult researchers, teen co-re...