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1

influence a person's emotions, perceptions, and behavior.
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Addictions may be based; the body becomes so accustomed to functioning in the presence of a drug that it cannot function in its absence. Or they may be based, in which case people believe that they need the drug in order to respond to the stresses of daily living.
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are drugs whose effect on the central nervous system causes a rise in heart rate, blood pressure, and muscle tension.
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are drugs that affect the operation of the neurotransmitter serotonin in the brain, causing an alteration in brain-cell activity and perception.





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