Cigarette headaches can be caused by smoke irritation, carbon monoxide poisoning and other reasons. 1. Smoke stimulation: cigarettes have more harmful substances, such as nicotine, etc. The smoke stimulates the respiratory tract, eyes and other parts of the headache and tears and other symptoms. 2. Carbon Monoxide Poisoning: Cigarette combustion produces carbon monoxide, some people smoke too much at one time, there will be a slight carbon monoxide poisoning, so that the hemoglobin and oxygen binding rate decreases, the body has a transient hypoxia, resulting in the symptoms of headache. 3. Increased blood pressure: nicotine in cigarettes will enhance sympathetic excitability, increase heart rate, blood output increases, blood vessel contraction spasms and lead to increased blood pressure, thus triggering headaches. Patients who suffer from smoking headaches should seek medical attention in a timely manner and under the guidance of a doctor to actively treat the symptoms. Smoking is harmful to the human body, and it is recommended to quit smoking in order to eliminate the adverse effects of smoking.