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.


Oroville is the county seat of Butte County, California, United States. The population was 15,506 at the 2010 census, up from 13,004 in the 2000 census. Oroville is considered the gateway to Lake Oroville and Feather River recreational areas. The city of Oroville has recently annexed two locations in South Oroville, areas A and B, which have a combined population of 2,725 people. The U.S. Census Bureau estimated the population of the city to be 17,996 as of January 1, 2016, up 1,908 people or 11.9 percent since 2010. The Berry Creek Rancheria of Maidu Indians of California is headquartered here.

Oroville is located off of State Route 70, and is in close proximity to State Route 99, which connects Butte County with Interstate 5Chico, California is located about 25 minutes north of the city, and Sacramento lies about an hour south.

Oroville is situated at the base of the foothills on the banks of the Feather River where it flows out of the Sierra Nevada onto the flat floor of the Sacramento Valley. It was established as the head of navigation on the Feather River to supply gold miners during the California Gold Rush.

The town was originally called “Ophir City”, but the name was changed to Oroville when the first post office opened in 1854 (“oro” is “gold” in Spanish).[6] The City Of Oroville was incorporated on January 3, 1906.

Gold was found at Bidwell Bar, one of the first gold mining sites in California, bringing thousands of prospectors to the Oroville area seeking riches. Now inundated by the waters of enormous Lake Oroville, which was filled in 1968, Bidwell Bar is memorialized by the Bidwell Bar Bridge, an original remnant from the area and the first suspension bridge in California (California Historical Landmark #314). In the early 20th century the Western Pacific Railroad completed construction of the all-weather Feather River Canyon route through the Sierra Nevadas giving it the nickname of “The Feather River Route”. Oroville would serve as an important stop for the famous California Zephyr during its 20-year run. In 1983, this became a part of the Union Pacific Railroad as their Feather River Canyon Subdivision. A major highway, State Route 70, roughly parallels the railroad line winding through the canyon.