Drug abuse is a patterned use of a drug in which the user consumes the substance in amounts or with methods neither approved nor supervised by medical professionals. Drug abuse is not limited to mood-altering or psychoactive drugs. If an activity is performed using the objects against the rules and policies of the matter (as in steroids for performance enhancement in sports), it is also called substance abuse. Therefore, mood-altering and psychoactive substances are not the only types of drugs abused. Using illicit drugs – narcotics, stimulants, depressants sedatives, hallucinogens, cannabis, even glues and paints, are also considered to be classified as drug/substance abuse. Substance abuse often includes problems with impulse control and impulsive behaviour.
Depending on the actual compound, drug abuse including alcohol may lead to health problems,social problems, morbidity, injury, violence, death,homicides,suicides.Drug abuse, including alcohol and prescription drugs can induce symptomatology which resembles mental illness. This can occur both in the intoxicated state and also during the withdrawl state. In some cases these substance induced psychiatric disorders can persist long after detoxification, such as prolonged psychosis or depression after amphetamine or cocaine abuse. A protracted withdralw symptom can also occur with symptoms persisting for months after cessation of use. Benzodiazepines are the most notable drug for inducing prolonged withdrawal effects with symptoms sometimes persisting for years after cessation of use. Abuse of hallucinogens can trigger delusional and other psychotic phenomena long after cessation of use and cannabis may trigger panic attacks during intoxication and with use it may cause a state similar to dysthymia