Drug abuse occurs when drugs are used without medical advice and can lead to addiction. There are over 190 million drug users worldwide, especially among young adults. Reasons for drug addiction include family history, mental health issues, pain, life stresses, and lack of support systems. Drugs affect the brain's reward system and can negatively impact cognitive functions. Long-term effects of drug abuse include consequences for an individual's mental and physical health, family relationships and stability, and society through increased crime and loss of community cohesion. Preventing drug abuse requires addressing the root causes through lifestyle balance, stress management, social support systems, and community awareness and education programs.