Which statement about nicotine is true?

• A. It is the addictive drug found in tobacco
• B. Nicotine is not addictive
• C. It has no effect on the brain
• D. It only affects the lungs

Answer: (A)

Nicotine acts on the brain and creates dependence, which is why it’s the addictive drug found in tobacco. When nicotine enters the body, it quickly reaches the brain and binds to nicotinic acetylcholine receptors. That engagement releases dopamine in the brain’s reward pathways, producing a pleasant effect that strengthens the behavior of using tobacco. Over time, this leads to craving, tolerance, and withdrawal, all hallmarks of addiction.

Because of this brain action, statements that nicotine isn’t addictive or that it has no effect on the brain aren’t accurate. Nicotine’s primary impact is on brain chemistry and the body’s autonomic systems (like heart rate and blood pressure), not only on the lungs.