Addiction is a brain disorder characterized by compulsive engagement in rewarding stimuli despite adverse consequences.[8] Despite the involvement of a number of psychosocial factors, a biological process – one which is induced by repeated exposure to an addictive stimulus – is the core pathology that drives the development and maintenance of an addiction.[1][9] The two properties that characterize all addictive stimuli are that they are reinforcing (i.e., they increase the likelihood that a person will seek repeated exposure to them) and intrinsically rewarding (i.e., they are perceived as being inherently positive, desirable, and pleasurable).[1][3][7]

Addiction is a disorder of the brain’s reward system which arises through transcriptional and epigenetic mechanisms and occurs over time from chronically high levels of exposure to an addictive stimulus (e.g., eating food, the use of cocaine, engagement in sexual activity, participation in high-thrill cultural activities such as gambling, etc.).[1][10][11] ΔFosB, a gene transcription factor, is a critical component and common factor in the development of virtually all forms of behavioral and drug addictions.[10][11][12][13] Two decades of research into ΔFosB’s role in addiction have demonstrated that addiction arises, and the associated compulsive behavior intensifies or attenuates, along with the overexpression of ΔFosB in the D1-type medium spiny neurons of the nucleus accumbens.[1][10][11][12] Due to the causal relationship between ΔFosB expression and addictions, it is used preclinically as an addiction biomarker.[1][10][12] ΔFosB expression in these neurons directly and positively regulates drug self-administration and reward sensitization through positive reinforcement, while decreasing sensitivity to aversion.[note 1][1][10]

Addiction exacts an “astoundingly high financial and human toll” on individuals and society as a whole.[14][15][16] In the United States, the total economic cost to society is greater than that of all types of diabetes and all cancers combined.[16] These costs arise from the direct adverse effects of drugs and associated healthcare costs (e.g., emergency medical services and outpatient and inpatient care), long-term complications (e.g., lung cancer from smoking tobacco productsliver cirrhosis and dementia from chronic alcohol consumption, and meth mouth from methamphetamine use), the loss of productivity and associated welfare costs, fatal and non-fatal accidents (e.g., traffic collisions), suicides, homicides, and incarceration, among others.[14][15][16][17] Classic hallmarks of addiction include impaired control over substances or behavior, preoccupation with substance or behavior, and continued use despite consequences.[18] Habits and patterns associated with addiction are typically characterized by immediate gratification (short-term reward), coupled with delayed deleterious effects (long-term costs).[19]

Examples of drug and behavioral addictions include alcoholismamphetamine addictioncocaine addictionnicotine addictionopioid addictionfood addictiongambling addiction, and sexual addiction. The only behavioral addiction recognized by the DSM-5 and the ICD-10 is gambling addiction. The term addiction is misused frequently to refer to other compulsive behaviors or disorders, particularly dependence, in news media.[20] An important distinction between drug addiction and dependence is that drug dependence is a disorder in which cessation of drug use results in an unpleasant state of withdrawal, which can lead to further drug use.[21] Addiction is the compulsive use of a substance or performance of a behavior that is independent of withdrawal. Addiction can occur in the absence of dependence, and dependence can occur in the absence of addiction, although the two often co-occur.



Corry is a city in northwestern Pennsylvania in the United States. With a population of 6,605 at the 2010 United States Census, it is the second largest city in Erie County. Corry is a part of the Erie, PA Metropolitan Statistical Area. The city became famous in the late-19th and early-20th centuries for being the manufacturer of Climax locomotives.

Erie County was formed from parts of Allegheny County on March 12, 1800.[1] On May 27, 1861, tracks owned by the Atlantic and Great Western Railroad intersected with those of the Sunbury and Erie Railroad and was called the “Atlantic and Erie Junction”.[2][3] Land at the junction was owned by Hiram Cory, who sold a portion to the Atlantic and Great Western in October 1861. The railroad built a ticket office at the junction and named it for Cory, but through a misspelling it became Corry.[2]

The combination of railroad growth and the discovery of oil in nearby Titusville contributed greatly to Corry’s development. This boomtown was chartered as a borough in 1863 and designated as a city in 1866. Industry has played a big part in Corry’s growth, and the Corry Area Historical Society maintains a museum where one of the Climax locomotives (the steam engine used in logging operations that brought fame to Corry) is on display.

Corry has been named a Tree City USA for seven consecutive years.[4]

The Corry Armory was listed on the National Register of Historic Places in 1991.[5]