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Hi Mary Elizabeth. Oversensitivity to smell is known as hyperosmia and often follows a bout from infections in the sinuses or partial damage to the the olfactory nerve. That you have reoccurring experiences with one specific type of odor
(cigarette smoke) when it is not apparent in the environment is called an olfactory hallucination. This sometimes happens to people with seizure disorders that originate in the part of the brain where smell is perceived. Some distortions in smell are also attributed to various forms of depression. Yours seems more infection-related, which may take a bit of time to correct itself. Eating well helps greatly.
In peace, Roy
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