Quitting smoking has huge benefits but it's not all easy. Lots of people experience nicotine withdrawal symptoms, ranging from headaches, anxiety, and nausea, to sadness and depression. Symptoms are usually worst during the first week after quitting and should get less each day. For some people symptoms go on for longer. Your local NHS Stop Smoking Service, GP or pharmacist can help with advice, support, and treatment. This may include cutting down smoking gradually, using nicotine replacement therapy (NRT) products, or using medication, to help avoid withdrawal symptoms.