Stem Cell Study of Genetics and Drug Addiction

Background: \- Researchers are interested in studying the roles that genes play in drug and alcohol addiction. Genes seem to account for about half of the differences between people who become addicted to drugs and people who do not. This study will collect blood and skin cell samples. These cells will be used to develop stem cells that are useful for studying how genes are related to drug use and dependence. Objectives: \- To study genetic and cellular differences between people who are addicted to drugs and those who are not. Eligibility: * Individuals between 21 and 65 years of age who do not use drugs. * Individuals between 21 and 65 years of age who are in treatment with buprenorphine or methadone. Design: * Participants will be screened with a brief physical exam and medical history. * Participants will also answer questions about physical and mental health, quality of life, and history of drug and alcohol use. A urine sample and cheek swab sample will be collected. * Participants whose genetic samples match the study requirements will be asked to come back to provide a skin biopsy sample and a second urine sample.