Nicotine, which is found in cigarettes, is a powerful stimulant and can cause increased vascular activity in the brain which could lead to headaches. Also, some people have allergies to smoke or odor sensitivity, that even slight exposure to cigarette smoke can trigger their migraines.
You should stop smoking not just because of your migraines but for your general health. There is a clear association of smoking with lung cancer and this is evidenced by a lot of clinical studies.
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