• Health condition: People with asthma, emphysema
or other respiratory diseases, chronic obstructive pulmonary
disease (COPD), depression, multiple chemical sensitivity,
or stress-induced illnesses are usually more sensitive to odors
• Time of day: People are generally more sensitive to odors in the morning than in the evening.
• Type of odor: Some odors lessen a person’s ability to detect or “smell”them; these types of odors seem to go away within just a few moments when they are actually still present.