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Introduction to Stimulants Stimulants affect the neurological system by altering neurotransmitter levels. Key neurotransmitters impacted include dopamine, serotonin, norepinephrine, GABA, glutamate, and acetylcholine. Dopamine’s Role in Addiction Dopamine regulates movement, motivation, and mood. It plays a major role in the brain's reward pathways, which can reinforce addictive behaviors. Stimulants increase dopamine release, creating feelings of pleasure and reinforcing drug use. Stimulant Effects on the Nervous System Stimulants trigger the stress response, causing a release of norepinephrine, dopamine, and cortisol. This results in heightened focus, energy, and mood regulation, but also leads to issues such as agitation and potential cardiovascular effects. Tolerance and Dependency Over time, the body can become tolerant to stimulants, requiring higher doses for the same effect. Psychological and physiological dependency can develop, leading to withdrawal symptoms such as fatigue, depression, a