Withdrawal symptoms and nicotine
A smokers nervous system becomes accustomed to functioning with nicotine.
When you stop smoking, the reduced nicotine intake will disturb the balance of the central nervous system, causing withdrawal symptoms.
The most common withdrawal symptoms are:
Cravings for tobacco
Fortunately, the majority of these symptoms tend to disappear after a few weeks. Some people may experience cravings, concentration problems and an increased appetite over a longer time period.http://www.netdoctor.co.uk/smoking/withdrawalsymptoms_000507.htm