Addiction (known clinically as severe substance use disorder) is a multifaceted condition. It is a disease that results in the compulsive consumption of a substance, in spite of the harmful consequences. People afflicted with addiction have an overwhelmingly intense focus on using a certain substance or substances (primarily alcohol and/or drugs), to the point that it dominates their lives. There are a number effective treatments available, and people can recover from addiction and go on to lead normal, productive lives.