What describes a rapid response to a substance, often resulting in immediate health effects?

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Immediate health effects from exposure describe an acute reaction. This means the body's response shows up quickly after contact with a substance—such as eye or throat irritation, dizziness, headaches, or coughing—and tends to be short-lived. Chronic effects develop from long-term or repeated exposure over extended periods, not right away. A delayed onset means symptoms appear after a lag period, not immediately. Tolerance is the body’s reduced response with repeated exposure, requiring more of the substance to achieve the same effect, which isn’t about an immediate reaction. In an automotive refinishing setting, acute reactions are what you’d expect to notice right away when fumes or splashes occur.