Which statement best describes nicotine?

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Multiple Choice

Which statement best describes nicotine?

Nicotine acts as a central nervous system stimulant and is highly addictive because it rapidly stimulates nicotinic acetylcholine receptors, triggering a surge of dopamine in reward pathways. This combination of stimulant effects and strong reinforcement makes dependence common and hard to break. It’s not a mild sedative—nicotine increases alertness and heart rate, not calming effects. The understanding that nicotine’s addiction potential can rival that of hard drugs reflects how powerful the reinforcement is, especially with quick delivery through smoking. There is a documented lethal dose—about 60 milligrams for an adult if ingested—though the exact amount can vary by route and individual factors. Statements claiming there’s no lethal dose or that nicotine is safe in any amount aren’t accurate.

Nicotine acts as a central nervous system stimulant and is highly addictive because it rapidly stimulates nicotinic acetylcholine receptors, triggering a surge of dopamine in reward pathways. This combination of stimulant effects and strong reinforcement makes dependence common and hard to break. It’s not a mild sedative—nicotine increases alertness and heart rate, not calming effects. The understanding that nicotine’s addiction potential can rival that of hard drugs reflects how powerful the reinforcement is, especially with quick delivery through smoking. There is a documented lethal dose—about 60 milligrams for an adult if ingested—though the exact amount can vary by route and individual factors. Statements claiming there’s no lethal dose or that nicotine is safe in any amount aren’t accurate.

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