PART I: THEORETICAL AND EMPIRICAL FOUNDATIONS OF THE STUDY.- Chapter 1: Introduction.- Chapter 2. Theoretical Background and Literature Review.- Chapter 3. Methodology.- PART II: THE SHETLAND HEROIN SCENE - LOCATION-SPECIFIC CHARACTERISTICS AND HISTORICAL EVOLUTION.- Chapter 4. Shetland and Substance Use.- Chapter 5. The Features and Descriptive Characteristics of Heroin Scene in Shetland.- Chapter 6. The Internal Structure of the Heroin Scene in Shetland.- Chapter 7. The Shetland Heroin Scene from a Historical Perspective: Five Distinct Eras.- Chapter 8. The Current Heroin Using Trend in Shetland.- Chapter 9. The Community-Minded Spirit of the Shetland Heroin Scene.- Chapter 10. Summary of Part II.- PART III: COMMUNITY-MINDEDNESS AND SELF-REGULATION IN DRUG CULTURES.- Chapter 11: Community-Mindedness and Self-Regulation in Heroin Scenes in the Scientific Literature.- Chapter 12: Explaining Drug Markets and Distributions Systems.- Chapter 13. Historical Transitions of Urban Drug Markets and Scenes.- Chapter 14. The British, Scottish and Shetland Heroin Trends in Numbers.- Chapter 15. Media Reports on Heroin in Shetland.- Chapter 16. Heroin Use in Relation to the Location-Specific Particularities of the Shetland Islands.- Chapter 17. Explaining the Evolution of Drug Eras.- Chapter 18. Future Prognosis of the Shetland Heroin Scene.- PART IV: PROMOTING SELF-REGULATION AND SOCIAL INTEGRATION OF DRUG CULTURES.- Chapter 19. A Model of Self-Regulation and Social Integration of Drug Subcultures.- References.-