Essential oils are comprised of naturally occurring chemicals that work in synergy with one another. Because essential oils evaporate quickly (known as being "volatile"), their molecules are easily inhaled. Without providing an intimidating lesson in olfaction (the science of the sense of smell), the inhalation of these naturally occurring synergistic chemicals provide triggers to our brain. These triggers effect our emotions. Inhalation of these wondrous molecules also provides physical benefit which may also work together to aid in our emotional state.
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[Source: https://www.aromaweb.com/articles/emotionalwellbeing.asp]
