If you are uncomfortable and have generalized aches and pains after quitting smoking, consider that you may be suffering from smoking cessation syndrome. Frequent smokers who suddenly quit smoking may experience a series of discomfort such as irritability, dizziness, headache, insomnia, apprehension, decreased heart rhythm, increased appetite or weight, cough, excessive sweating, etc. This is medically known as nicotine withdrawal syndrome, also called smoking cessation syndrome. The smoking cessation syndrome occurs when the intake of nicotine decreases rapidly during smoking cessation and does not reach the level required by the brain. The smoking cessation syndrome may occur during the smoking cessation process, regardless of whether medication is taken or other circumstances, and the older the smoker, the greater the chance of having the cessation syndrome when quitting.