Unusual sensitivity: Cigarette smoke may cause headaches in a bunch of ways, from the nicotine itself, to many other toxic chemicals in the smoke, especially carbon monoxide. Some people have unusual sensitivities, and you seem to be one of them. Don't hang around smokers, don't let people smoke in your home if you can, and if you can't consider use of smoke-eaters.
Answered 2/28/2016
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