Although widely available, little is known about the effectiveness of youth cessation treatments delivered in real-world settings. The authors recruited a nonprobability sample of 41 community-based group-format programs that treated at least 15 youth per year and included evidence-based treatment components. Data collection included longitudinal surveys of youth participants (n = 878); posttreatment surveys of program leaders (n = 77); and one-time surveys of organizational leaders (n = 64)and community leaders in education, health, and juvenile justice (n = 94). Information about smoking-related ordinances was collected at the state and local levels. The framework, evaluation design, and implementation strategies described in this article provide a template for large-scale real-world program evaluations. (Contains 4 tables and 3 figures.)