A person who hasn’t smoked in two hours and is irritable is showing symptoms of

nicotine withdrawal. Withdrawal symptoms can vary from person to person, but some common symptoms include irritability, restlessness, cravings, difficulty concentrating, increased appetite, and mood swings. These symptoms typically start a few hours after the last cigarette and can last for several weeks. It is important for individuals experiencing nicotine withdrawal to seek support and find strategies to manage cravings and irritability, as it can be a challenging process.