Contents EDITORIAL: The Natural History and Social Ecology of Addictive BehaviorsA Strategy for the Biological Assessment of Addiction Diagnosis in the Addictions 1: Conceptual Problems Causal Factors in Onset of Adolescents’ Cigarette Smoking: A Prospective Study of Urban Black Youth Caffeine: A Potential Drug of Abuse Methadone Maintenance: Past, Present, and Future Implications of Models for Recovery from Alcoholism Controlled Opiate Use: Fact or Artifact? Addiction Relapse Addictions Paradigms Ill: From Theory-Research to Practice and Back SELECTIVE Guide to Current Reference Sources on Topics Discussed in This IssueIndex