Your body needs more energy and loses alot of water through breathing when it s cold. If you re sick, avoid dehydration by drinking more water. Caffeine and alcohol dehydrate your body. Try to drink an extra 8-ounce serving of water for every caffeinated or alcoholic beverage you have. Nursing mothers need more water for breast milk.
Smoking can also have a dehydrating effect.
So if you smoke, be sure to drink more water.