Drug abuse is a complex social, psychological and biological phenomenon that cannot be explained by a single factor. Various theories have been developed by scholars to understand why individuals start using drugs, why some people become dependent on substances, and why drug abuse persists despite its harmful consequences. These theories provide important insights for prevention and intervention strategies in the field of substance abuse. One of the earliest explanations is the biological theory of drug abuse. According to this perspective, drug dependence is influenced by genetic and physiological factors. Some individuals may inherit a biological predisposition that makes them more vulnerable to substance use disorders. Research suggests that differences in brain chemistry, particularly in neurotransmitters such as dopamine, influence feelings of pleasure and reward. Drugs such as alcohol, opioids, and stimulants affect the brain’s reward system, creating intense feelings of euphoria that encourage repeated use. Over time, the brain adapts to the presence of the substance, leading to tolerance and dependence. Biological theories emphasize that addiction is partly a disease of the brain and requires medical as well as psychological treatment. Psychological theories also play a significant role in explaining drug abuse. One important psychological explanation is the psychoanalytic theory. This theory, influenced by the ideas of Sigmund Freud, suggests that drug abuse is related to unresolved conflicts in the unconscious mind. Individuals who experience emotional distress, anxiety, or feelings of inadequacy may turn to drugs as a means of escape. Substance use becomes a coping mechanism to deal with internal conflicts or traumatic experiences. According to this perspective, addiction may reflect an attempt to achieve pleasure or avoid psychological pain. Another important psychological perspective is the behavioral theory. Behavioral theorists argue that drug use is learned through processes such as conditioning and reinforcement. When individuals use drugs and experience pleasurable effects such as relaxation, excitement, or relief from stress, the behavior is positively reinforced. This reinforcement increases the likelihood that the person will continue using the substance. Over time, environmental cues such as certain places, people, or emotional states become associated with drug use and trigger cravings. Prevention programs based on behavioral theory often focus on modifying