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Abstract
Aromatherapy is commonly used for stress relief, yet the evidence for its effectiveness is weak due to the poor quality of previous studies and lack of understanding for the aromatherapy mechanism. The main goal of this work was to use a rigorous randomized control trial (RCT) design to assess effects of a popular stress-reducing aromatherapy on subjective, physiologic, and cognitive measures sensitive to stress. Additionally, the study evaluated the role of a psychological mechanism (expectancy) in aromatherapy actions.