Substance abuse and addiction are related concepts but not interchangeable. Substance abuse refers to the excessive and problematic use of a substance, such as drugs or alcohol, that interferes with a person’s daily life, relationships, and responsibilities. Addiction, on the other hand, is a chronic and compulsive disorder characterized by a physical and psychological dependence on a substance. It involves a strong craving or urge to use the substance, as well as difficulty controlling or stopping use despite negative consequences. While substance abuse can lead to addiction, not all substance abusers develop addiction. Addiction typically requires specialized treatment to address the physical and psychological dependence on the substance, whereas substance abuse may be treated through counseling, behavioral therapy, and lifestyle changes.