Smoking is a habit that harms health, causing 6 million deaths every year. There are many people who declare quitting smoking at the beginning of the new year, but the number of smokers around the world is still over 1 billion. Even after quitting smoking, there are many people who cannot overcome the withdrawal symptoms caused by nicotine addiction, so they start smoking again. Another side effect of quitting smoking is weight gain. It is easy to see examples of people gaining weight after quitting smoking.