Our previous units have focused on primary treatment. Primary treatment interventions that address how to intervene once an addiction has been established are distinct from prevention interventions. Prevention interventions are generally intended to be applied to a much wider population than primary treatment interventions. By influencing the choices in a larger population regarding initiation and frequency of use, the goal of prevention efforts is to reduce the population that would meet diagnostic criteria for substance use or gambling. The target population for many prevention interventions tend to be youth, as the trends for lifetime use tend to peak for adults in their twenties (Lopez-Quintero, et al., 2011).