Substance abuse, 
Also known as drug abuse, refers to a maladaptive pattern of use of a substance (drug) that is not considered dependent.^[Substance abuse/drug abuse is not limited to mood-altering or psycho-active drugs. Activity is also considered substance abuse when inappropriately used (as in steroids for performance enhancement in sports). Therefore, mood-altering and psychoactive substances are not the only drugs of abuse. Substance abuse often includes problems with impulse control and impulsivity.