Harm ReductionHealth PolicyNeedle-Exchange ProgramsSubstance Abuse, IntravenousUnited StatesTobacco, SmokelessOpiate Substitution TreatmentMethadoneCodependency (Psychology)Drug and Narcotic ControlGroup StructureStreet DrugsTobacco IndustryHIV InfectionsNeedle SharingLaw EnforcementDrug UsersRisk-TakingSubstance-Related DisordersSyringesPrisonsSelf-Help GroupsPoliceHungaryHomeless PersonsSex WorkersMarketingSmoking CessationSocial NetworkingPublic HealthOpioid-Related DisordersPolicy MakingPublic PolicyPublic OpinionRisk Reduction BehaviorSmokingPrisonersNarcoticsAttitude to HealthAlcohol DrinkingOrganizational PolicyProstitutionPolicy