Hypotonic SolutionsCell SizeOsmotic PressureHypertonic SolutionsSexual AbstinenceBrainMagnetic Resonance ImagingAtrophyOrgan SizeTemperanceSubstance Withdrawal SyndromeRecovery of FunctionSmoking CessationBrain MappingNeonatal Abstinence SyndromeBrain InjuriesImage Processing, Computer-AssistedBrain ChemistryAlcohol AbstinenceNeuropsychological TestsAlcoholismTobacco Use DisorderCognitionBrain NeoplasmsBlood VolumeTime FactorsCognition DisordersCocaine-Related DisordersNeuroimagingImaging, Three-DimensionalCerebral CortexLead Poisoning, Nervous System, AdultBupropionTobacco Use Cessation ProductsNicotineAgingImage Interpretation, Computer-AssistedNerve Fibers, MyelinatedLongitudinal StudiesFrontal LobeAnalysis of VarianceCaudate NucleusBrain EdemaCognitive ReserveCerebral VentriclesSmokingTreatment OutcomeIntelligenceBehavior, AddictiveAlcohol-Induced Disorders, Nervous SystemReproducibility of ResultsBrain IschemiaCerebrumAlzheimer DiseaseFollow-Up StudiesSchizophreniaIntelligence TestsSchizophrenia, DisorganizedLinear ModelsHippocampusAge FactorsMotivationChewing GumNicotinic AgonistsLeukoencephalopathiesMethadoneSex CharacteristicsCerebellumBrain Damage, ChronicProspective StudiesFunctional LateralityAlcoholics AnonymousAlcohol DeterrentsBrain StemSelf AdministrationToken EconomyCase-Control StudiesBrain InfarctionRecurrenceReference ValuesRegression AnalysisRats, Sprague-DawleyCerebrovascular CirculationPlasma VolumeNeuronsHeroin DependenceNarcoticsBehavior, AnimalLateral VentriclesStroke VolumeDiffusion Magnetic Resonance ImagingCocainePsychiatric Status Rating ScalesCohort StudiesAlcoholicsSex FactorsTemporal LobeEthanolGyrus CinguliDisease Models, Animal