MethadoneAlcohol AbstinenceNarcoticsOpiate Substitution TreatmentOpioid-Related DisordersFood PreferencesBehavior, AddictiveHeroin DependenceAppetiteAlcohol DeterrentsMethadyl AcetateCacaoSmoking CessationBrain ChemistryAnalgesics, OpioidBuprenorphineDietary SucroseTobacco Use DisorderBrain InjuriesNaltrexoneSubstance Withdrawal SyndromeNeonatal Abstinence SyndromeBrain NeoplasmsHeroinCuesSmokingBrain MappingTasteSubstance Abuse DetectionDietary CarbohydratesFeeding BehaviorAlcoholismAffectBrainPyrrolidinesBrain EdemaDrug OverdoseQuestionnairesBrain StemMorphineBrain IschemiaDietary FatsNarcotic AntagonistsTreatment OutcomeSubstance Abuse, IntravenousDextropropoxypheneStreet DrugsSubstance-Related DisordersMagnetic Resonance ImagingCocaine-Related DisordersOpiumBrain AbscessObesityDose-Response Relationship, DrugStereoisomerismOxidoreductases, N-DemethylatingNaloxoneMeconiumDrug InteractionsTherapeutic CommunityTime FactorsNeuronsDirectly Observed TherapyHypoxia, BrainPrisonersCocaineBlood-Brain BarrierCerebral CortexRats, Sprague-DawleyCodeine