Addiction - A physiological or psychological dependence on a substance such as alcohol or drugs., Desensitization - Process by which neurons in the brain break down neurotransmitter receptors in response to a larger amount of neurotransmitter in the synapse than usual, Tolerance - The condition in drug addiction in which greater amounts of a drug are needed to achieve the desired affect, Sensitization - Process by which a neuron adds more receptors to its surface in response to consistently lower amounts of a neurotransmitter in the synapse, Stimulant - A drug that increases the activity of the body or the activity of some part of the body, Depressant - A drug that reduces functional activity and produces muscular relaxation,

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