Dr Axel Klein specialises in the study of addictive behaviour at the University of Kent.
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"Mimicking addictive behaviour in animals is much easier than mimicking depressed or schizophrenic behaviour, " said Prof Spanagel.
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Rather, they suspect that addictive behaviour is the result of the same brain chemistry that helps prevent Parkinson's.
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Cocaine works by enhancing its effects, and it is believed to be involved in other sorts of addictive behaviour as well.
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Their theory is that smokers smoke because their brains have high levels of dopamine, a brain chemical believed to stimulate addictive behaviour.
For any behaviour to be defined as addictive, there have to be specific consequences such as it becoming the most important activity in the person's life or being the way they improve their mood.
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