**Question:** Which is not a feature of nicotine withdrawal?

A. Increased appetite
B. Improved mood
C. Increased anxiety
D. Increased sleep

**Core Concept:** Nicotine is a stimulant found in tobacco products that binds to nicotinic acetylcholine receptors, leading to physiological and psychological dependence. Nicotine withdrawal occurs when a tobacco user stops or reduces consumption, causing a range of symptoms.

**Why the Correct Answer is Right:** Improved mood is a common feature of nicotine withdrawal, as individuals experience a "rebound" effect when nicotine levels drop. This rebound effect can cause an initial temporary improvement in mood, leading some to continue using tobacco.

**Why Each Wrong Option is Incorrect:** Increased appetite (option A) and increased sleep (option D) are generally seen during nicotine withdrawal, not improved mood. Nicotine withdrawal symptoms often include insomnia and weight gain due to decreased appetite.

**Clinical Pearl:** Nicotine withdrawal is typically managed through gradual reduction in tobacco consumption, nicotine replacement therapy (e.g., patches, gums), and addressing underlying psychological factors.

**Correct Answer:** Improved mood (Option B) is not a feature of nicotine withdrawal; instead, it may lead to continued tobacco use.