Disease model of addiction
The disease model of addiction describes an addiction as a disease with biological, neurological, genetic, and environmental sources of origin. The traditional medical model of disease requires only that an abnormal condition be present that causes discomfort, dysfunction, or distress to the individual afflicted. The contemporary medical model attributes addiction, in part, to changes in the brain's mesolimbic pathway. The medical model also takes into consideration that such disease may be the result of other biological, psychological or sociological entities despite an incomplete understanding of the mechanisms of these entities.
Genetic factors and mental disorders can contribute to the severity of drug addiction. Approximately fifty percent of the chance a person will develop an addiction can be attributed to genetic factors. 
Critics of the disease model, particularly those who subscribe to the life-process model of addiction argue that labeling people as addicts keeps them from developing self-control and stigmatizes them. As noted by the harm reduction specialist Andrew Tatarsky:
|“||The essence of this model is the pragmatic recognition that treatment must meet active substance users ‘‘where they are’’ in terms of their needs and personal goals. Thus, harm reduction approaches embrace the full range of harm-reducing goals including, but not limited to, abstinence.||”|
- McLellan et al., Addiction is a Chronic Brain Disease (2000). Archived at the National Institute on Drug Abuse website.
- Leshner, Alan I., Addiction Is a Brain Disease, and It Matters, Science 3 October 1997: Vol. 278. no. 5335, pp. 45 - 47
- Nestler EJ (December 2013). "Cellular basis of memory for addiction". Dialogues Clin Neurosci. 15 (4): 431–43. PMC . PMID 24459410.
Despite the importance of numerous psychosocial factors, at its core, drug addiction involves a biological process: the ability of repeated exposure to a drug of abuse to induce changes in a vulnerable brain that drive the compulsive seeking and taking of drugs, and loss of control over drug use, that define a state of addiction. Here, we review the types of molecular and cellular adaptations that occur in specific brain regions to mediate addiction-associated behavioral abnormalities. These include alterations in gene expression achieved in part via epigenetic mechanisms, plasticity in the neurophysiological functioning of neurons and synapses, and associated plasticity in neuronal and synaptic morphology mediated in part by altered neurotrophic factor signaling. [emphasis in original]
- "Addiction as a Disease." The National Center on Addiction and Substance Abuse. The National Center on Addiction and Substance Abuse, 23 Aug. 2016. Web. 23 Nov. 2016.
- Tatarsky, Andrew (24 April 2003). "Harm reduction psychotherapy: Extending the reach of traditional substance use treatment" (PDF). Journal of Substance Abuse Treatment. 25: 249–256. doi:10.1016/s0740-5472(03)00085-0. Retrieved 11 July 2011.
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