High blood pressure
The kids are running around the house screaming. One has a cat, the other a bottle of dishwashing liquid. They're heading for the bathroom. Your head is pounding as you rush after them; you arrive seconds before your Persian sinks her claws into your five-year-old. After you dry off the cat, lecture the children, and bring out some popcorn to distract them, that extra cup of coffee and sweet roll are starting to look pretty good. If you smoke, you're probably reaching for the pack by now. After all, you deserve it, don't you?