Every two to three hours, the nicotine starts to run low in the body. As they say in the East, there is no such thing as one sick organ. You can only have two or more sick organs. If one organ is underactive, other organs have to compensate by being over active. One organ affects the whole system. Even though nicotine is not supposed to be part of the system, the body has learned its normal nicotine levels. If you suddenly take nicotine out of the system, the body has to re-learn its chemical balance.
The good news is that almost all of the nicotine is out of the body by day three. The only permanent cure to nicotine withdrawal symptoms is to not smoke. On day three, once the nicotine has reached zero, it has nowhere to drop to. On day four, the nicotine addiction has ended. Hypnosis Quit Smoking