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Addiction is a biopsychosocial disorder characterized by repeated use of drugs, or repetitive engagement in a behavior such as gambling, despite harm to self and others.

The brain disease Essay On Road To Rehab posits that addiction is Essay On Road To Rehab disorder of the brain's reward system which arises through transcriptional and epigenetic mechanisms and develops over time from chronically high levels of exposure to an addictive stimulus e.

Addiction exacts an "astoundingly high financial and human toll" on individuals and society as a whole. Examples of drug and behavioral addictions include alcoholismmarijuana addictionamphetamine addictioncocaine addictionnicotine addictionopioid addictionfood addictionchocolate addictionvideo game addictiongambling addictionand sexual addiction. With the introduction of the ICD gaming addiction was appended. Addiction can occur in the absence of dependence, and dependence can occur in the absence of addiction, although the two often occur together.

Cognitive control and stimulus controlwhich is associated with operant and classical conditioningrepresent opposite click here i.

The term behavioral addiction refers to a compulsion to engage in a natural reward — which is a behavior that is inherently rewarding i. Reviews of preclinical studies indicate that long-term frequent and excessive consumption of high fat or sugar foods can produce an addiction food addiction. Chocolates' sweet flavour and pharmacological ingredients is known to create a strong craving or feel 'addictive' by the consumer. Chocolate is not yet formally recognised by the DSM-5 as a diagnosable addiction.

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Gambling provides a natural reward which is associated with compulsive behavior and for which clinical diagnostic manuals, namely the DSM-5have identified diagnostic criteria for an "addiction". There is evidence from functional neuroimaging that gambling activates the reward system and the mesolimbic pathway in particular.

There are a number of genetic and environmental risk factors for developing an addiction, that vary across the population. It has long been established that genetic factors along with environmental e.

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For example, altered levels of a normal protein due to environmental factors could then change the structure or functioning of specific brain neurons during development. These altered brain neurons could change the susceptibility of an individual to an initial drug use experience. In support of this hypothesis, animal studies have shown that environmental factors such as stress can affect an animal's genotype. Overall, the data implicating specific Essay On Road To Rehab in the development of drug addiction is mixed for most Essay On Road To Rehab. One reason for this may be that the case is due to a focus of current research on common variants. Genome-wide association studies GWAS are used to examine genetic associations with dependence, addiction, and drug use.

These studies employ an unbiased approach to finding genetic associations with specific phenotypes and give equal weight to all regions of DNA, including those with no ostensible relationship to drug metabolism or response. These studies rarely identify genes from proteins previously described via Graduation Speech The Coaching Classroom knockout models and candidate gene analysis. Instead, large percentages of genes involved in processes such as cell adhesion are commonly identified. This is not to say that previous findings, or the GWAS findings, are erroneous. The important effects of endophenotypes are typically not capable of being captured by these methods. Furthermore, genes identified in GWAS for drug addiction may be involved either in adjusting brain behavior prior to drug experiences, subsequent to them, or both.

A study that highlights the significant role genetics play in addiction is the twin studies. Twins have similar and sometimes identical genetics. Analyzing these genes in relation to genetics has helped geneticists understand how much of a role genes play in addiction. Studies performed on twins found that rarely did only one twin have an addiction.]