Seeking out drugs and taking drugs evolve into activities that take up a large amount of an addict’s time and thoughts, most often at the expense of other daily life activities.
Even though these types of behavior produce many adverse consequences, an individual who is addicted is perhaps most defined by their inability to stop, even if they want to stop.
Scientists have found that almost every abused drug whose use results in pleasure activates the brain’s reward system.
They act as a shortcut straight to this reward system by firing a large amount of dopamine into the nucleus accumbens, a region of the brain involved in processing pleasure, motivation, and reward.
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Studies have shown that prolonged drug abuse can actually alter the physical and chemical structures of the brain, and even produce a brain disorder, called addiction or dependence.
Drug addiction is distinguished by a pathological longing for drugs to the point where a want becomes a need.