... addiction. As an example of a drug which can be abused I shall look at Cocaine. Cocaine is a white powder refined from the coca plant, which grows in South America, it is a short acting stimulant which quickly reaches the brain and it produces effects such as talkativeness, excess confidence increased appetite and euphoria. As these effects only last around thirty minutes the user feels they need more in order to overcome the effects received on a 'come down´. These include paranoia and irritability. Regular users suffer poor sleeping patterns the feeling of not being able to cope without the drug. So how are these effects caused? Alcohol, cocaine, nicotine even caffeine are just some of the drugs which can lead to addition and abuse. All of these cause their effects through the brain, mostly it is the brain´s 'reward system´ where the effects begin. The network of neurons is ...

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