The amount of nicotine in NRT's is lower than those in cigarettes, so it is hard to get 'too much' nicotine, even when combining treatments (which should be done only with a doctor's guidance). You are likely to suffer symptoms of nicotine overdose, such as acute and severe numbness, difficulty breathing, dizziness, and nausea, before you reach any truly dangerous nicotine levels. If you do experience any of these symptoms, it is important to seek immediate medical attention. When used properly, your chances of an NRT overdose are small. If you have a slip and smoke a cigarette, do not stop your NRT, but return to abstinence. If you return to a regular pattern of smoking, stop your NRT, and develop a new quit plan for your next quit attempt.