Final answer:
The true statement about nicotine is that it stimulates the release of adrenaline and endorphins in the brain. It is highly addictive and works by binding to acetylcholine receptors, affecting the autonomic nervous system and impacting cardiovascular health. Option b.
Step-by-step explanation:
Of the provided statements regarding nicotine, the true statement is that it stimulates the release of adrenaline and endorphins in the brain. Nicotine binds to acetylcholine receptors, which leads to an increased release of various neurotransmitters, including dopamine. The introduction of nicotine into the body influences the autonomic system and especially affects the cardiovascular system by increasing sympathetic input, which can lead to cardiovascular risks. Moreover, nicotine replacement therapy (NRT) using products such as patches or gum is intended to manage withdrawal symptoms. Nicotine is indeed highly addictive and can cause dependence, contradicting the claims that it is a less addictive substance in tobacco or that the body does not build a tolerance for it. Additionally, it is not true that it takes several minutes for smokers to feel its effects; the effects of inhaled nicotine are typically felt within seconds due to the rapid absorption through the lungs. Option b.