Nicotine withdrawal occurs when a person who regularly uses nicotine suddenly stops or reduces their intake. This can happen after quitting smoking or using other tobacco products. The body, which has become accustomed to nicotine, reacts to its absence, leading to various physical and psychological symptoms. Common symptoms of nicotine withdrawal include irritability, anxiety, difficulty concentrating, increased appetite, and cravings for nicotine. These symptoms can vary in intensity and duration, often peaking within the first week and gradually decreasing over time. Understanding these effects can help individuals prepare for the challenges of quitting nicotine.