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Alcohol and other drugs produce a positive feeling at first, but when the effect wears off, it leaves a person with opposite feelings of depression and irritability. The body's normal production of chemicals in the brain, which ordinarily produce feelings of pleasure, are suppressed, sending the brain into a state of depression. It physically demands more of the drug to go back to "normal'' and feel good again. This pleasure/tension cycle leads to physical loss of control over the use of alcohol and other drugs - and results in addiction.

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Q: What is neurophysiology of addiction?
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