Once you stop smoking, you may experience nicotine withdrawal, which can last from a few days to a few weeks. Common withdrawal symptoms include feeling tense, irritable or depressed, appetite changes, constipation and gas, difficulty concentrating, difficulty falling asleep, cough, dry throat and mouth, nasal drip and dizziness. The first week is often the most challenging. However, as your body adjusts and recovers from the addiction of smoking, you will start to feel better. Although the effects of withdrawal can be unpleasant, it’s important to remember the benefits of quitting smoking: you may cough less and be able to exercise more easily, you won’t smell of cigarettes, and your sense of smell and taste will return — and, of course, you will save more money.