Two possibilities: Migraine and focal seizure can be precipitated by aromas. Psychiatric issues are a distant third consideration (much less common) Some agents can cause loss of consciousness because that is what they are intended to be used for (inhaled anesthetics) but is not likely you would be casually exposed to these. Household cleaning agents can make you feel lightheaded (this should be obvious as well)
Answered 11/27/2017
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A doctor has provided 1 answer
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