The practice of using aromas to influence people's moods; a term often used to describe products with artificial scents, which disqualifies them from being genuine aromatherapy. According to personal care writer Sarah Mandel, "If natural essential oils can be likened to diamond, synthetic fragrances are cubic zirconia." Regulations to distinguish which products are truly natural aromatherapy and which are artificial aromachology are in development by the National Association for Holistic Aromatherapy.

a branch of aromatherapy concerned with the physiological effects of scents. Current research is concerned with the selection of scents with calming of uplifting effects and the physical measurement of those effects.

The science, coined by the Olfactory Research Fund, dedicated to the study of the interrelationship between psychology and aroma.