<unk>  abuse, also known as drug abuse, is a patterned use of a<unk>  (drug) in which the user consumes the<unk>  in amounts or with methods which are harmful to themselves or others. 
The drugs used are often associated with levels of intoxication that alter judgment, perception, attention and physical control, not<unk>  with medical or therapeutic effects.  It is often thought that the main abused<unk> s are illegal drugs and alcohol; however it is becoming more common that prescription drugs and tobacco are a prevalent problem.<unk> s, including both<unk>  dependence and<unk>  abuse, can lead to large societal problems. It is found to be greatest in individuals ages 18–25, with a higher likelihood occurring in men compared to women, and urban residents compared to rural residents. On average, general medical facilities hold 20% of patients with<unk> s, possibly leading to psychiatric<unk> s later on. Over 50% of individuals with<unk> s will often have a "dual diagnosis," where they are diagnosed with the<unk>  abuse, as well as a psychiatric diagnosis, the most common being major depression, personality<unk> , anxiety<unk> s, and dysthymia.
Substance-related disorder
Opioid abuse and dependence
Somatoform disorder
Stimulant use disorder
Dissociative disorders
Drug dependence
Psychopathy
Tic disorder