What effect does nicotine have on the body?

Nicotine is a potent stimulant that primarily affects the central nervous system. When consumed, it binds to nicotinic acetylcholine receptors in the brain, leading to an increase in the release of neurotransmitters such as dopamine and norepinephrine. This stimulation elevates alertness, enhances focus, and boosts overall arousal.

The stimulating effects of nicotine can increase heart rate and blood pressure as well, which is consistent with its role in stimulating the nervous system. This is why it is often associated with increased energy levels and heightened cognitive functions in the short term.

While nicotine can also lead to effects like reduced appetite and may have some impact on memory, the primary and most well-documented immediate effect is its ability to stimulate the nervous system, making it the most appropriate choice in the context of this question.