Final answer:
Nicotine in tobacco is highly addictive, affecting the body's autonomic system and posing health risks like heart disease and cancer.
Explanation:
Nicotine, the major drug in tobacco, is highly addictive and affects the body's autonomic system. It stimulates the release of adrenaline, increases heart rate, blood pressure, and acts as a natural pesticide in plants. Tobacco use is associated with various health risks, including heart disease, stroke, and cancer.
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