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Harm ReductionElectrolysisPolarographyOxidation-ReductionNeedle-Exchange ProgramsStereoisomerismChromatography, High Pressure LiquidSubstance Abuse, IntravenousKineticsTobacco, SmokelessOpiate Substitution TreatmentMethadoneCodependency (Psychology)Drug and Narcotic ControlGroup StructureStreet DrugsTobacco IndustryNeedle SharingHIV InfectionsLaw EnforcementDrug UsersRisk-TakingSyringesSubstance-Related DisordersPrisonsSelf-Help GroupsPoliceHungaryMarketingHomeless PersonsSex WorkersSmoking CessationSocial NetworkingHealth PolicyOpioid-Related DisordersPublic PolicyPublic HealthPublic OpinionRisk Reduction BehaviorPrisonersSmokingNarcoticsAlcohol DrinkingProstitutionAttitude to Health