Smoking cessation
On average, people who quit smoking gain about 4 to 10 pounds. Why? First, nicotine curbs your appetite, so once you quit, you may feel increased hunger pangs, which leads to overeating. Nicotine also increases your metabolism, and some people don't decrease their calorie intake to compensate for the slowdown. Lastly, nicotine is notorious for dulling the taste buds, so you may find food tastes better once you kick the habit, which can lead to overindulgence.