Recruitment
DISEASE, RECRUITMENT
We advertised the trial to smokers through paper advertising (leaflets), digital advertising (WeChat) and staff (teachers and leaders). Potential participants contacted the local Disease Control and Prevention Center to register their interest. The research assistants explained the study to each potential participant and preliminarily assessed his or her eligibility. All eligible smokers were told they needed to come to a place on a fixed date to finalize the recruitment process.