This report presents a critical appraisal of the research article "A randomized clinical trial of the efficacy of extended smoking cessation treatment for adolescent smokers" by Bailey et al. (2013). The appraisal examines the study's title, rationale, sampling methods, and potential biases, including selection and allocation biases, and drop-out rates. The intervention's design, performance bias, and ethical considerations are also evaluated. The report highlights the study's strengths, such as the expertise of the research trainers, and weaknesses, such as the follow-up process. The findings suggest that extended school-based interventions with a psychosocial component can increase smoking cessation rates among adolescents, aligning with existing research emphasizing the importance of proper support and prolonged intervention periods. The report concludes that this extended smoking cessation strategy is effective and should be implemented in educational institutions.