Heroin affects the body by acting on opioid receptors, producing euphoria, pain relief, and relaxation, along with physical effects such as warm flushing, dry mouth, and drowsiness. It also slows the central nervous system, leading to reduced heart rate and slowed breathing, which can be dangerous at high doses. Other effects include constricted pupils, nausea, and vomiting. With repeated use, heroin can cause tolerance, physical dependence, and long-term damage to the respiratory system and other organ systems, with respiratory depression posing a major risk of overdose and death
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