<Tr> <Th> MedlinePlus </Th> <Td> 000953 </Td> </Tr> <Tr> <Td_colspan="2"> (edit on Wikidata) </Td> </Tr> <P> Nicotine withdrawal is a group of symptoms that occur in the first few weeks upon the abrupt discontinuation or decrease in intake of nicotine . Symptoms include cravings for nicotine, anger / irritability, anxiety, depression, impatience, trouble sleeping, restlessness, hunger or weight gain, and difficulty concentrating . A smoking cessation program may improve one's chance for success in quitting nicotine . Nicotine withdrawal is recognized in both the American Psychiatric Association Diagnostic and Statistical Manual and the WHO International Classification of Diseases . </P> <P> The most documented symptoms are cravings for nicotine, anger / irritability, anxiety, depression, impatience, trouble sleeping, restlessness, hunger or weight gain, and difficulty concentrating . Symptoms are usually strongest for the first few days and then dissipate over 2 - 4 weeks . Withdrawal symptoms make it harder to quit nicotine products and most methods for quitting smoking involve reducing nicotine withdrawal . The most common symptoms are irritability, anxiety and difficulty concentrating . Depression and insomnia are the least common . Other withdrawal symptoms may include constipation, cough, dizziness, drowsiness, headache, impulsivity, fatigue, flu symptoms, mood swings, mouth ulcers, and increased dreaming . Cessation of nicotine usually increases eating and weight, decreases memory, decreases the ability to pay attention and concentrate on tasks, and decreases heart rate . Cessation of tobacco can also require changes in levels of various medications . </P>

What are the body's physical and psychological responses to a lack of nicotine called