Substance abuse refers to the harmful or hazardous use of psychoactive substances, such as alcohol, tobacco, and drugs. It is characterized by the repeated and excessive use of substances despite negative consequences, such as health problems, social issues, and legal troubles. Substance abuse can lead to addiction, which is a chronic and relapsing brain disease characterized by compulsive drug-seeking behavior and the inability to control drug use. Substance abuse can have serious effects on an individual’s physical and mental health, as well as on their social and economic well-being.