Which of the following are withdrawal symptoms associated with nicotine?

The symptoms of nicotine withdrawal are well-documented and include a variety of physical and psychological responses as the body adjusts to the absence of nicotine. Increased appetite and insomnia are two of the most common withdrawal symptoms.

When an individual stops using nicotine, particularly from smoking, the body seeks to regain homeostasis and may result in a heightened sense of hunger as metabolism adjusts without the stimulant effects of nicotine. Insomnia is also prevalent during withdrawal, as many people experience difficulty sleeping due to increased irritability and restlessness that non-use brings. Both of these symptoms are reflective of the body adapting to the absence of nicotine and can be challenging for individuals trying to quit.

This understanding aligns well with the correct choice that highlights increased appetite and insomnia as key symptoms of nicotine withdrawal.