Question

what is one reason it may be harder for one person than another to quit nicotine use?
genetics
peer pressure
weight gain
celebrity use

Explanation:

Genetics can influence an individual's response to nicotine and their ability to quit. Genetic factors can affect how the body metabolizes nicotine, the brain - reward system's sensitivity to it, and the likelihood of experiencing withdrawal symptoms. Peer pressure, weight gain, and celebrity use are external factors, while genetics is an internal factor that can directly impact an individual's physiological and psychological response to nicotine.

Answer:

A. genetics