Why do some people gain weight?
Nicotine keeps you from feeling hungry and smoking dulls your senses of taste and smell. When you quit smoking, your appetite returns at the same time that your taste buds come back. What’s more, nicotine causes your body to burn slightly more calories.
The result is that after quitting, you're hungrier, food tastes better and you don’t burn as many calories. Plus, your body may confuse nicotine cravings for hunger, and you may find yourself snacking on unhealthy foods as a replacement for cigarettes.