Fuente: WIPO "essential oil or extracts" Disclosed herein is one embodiment of a biometric device that includes a housing, a sensor, and a controller. The housing has a main chamber and a breath chamber. The breath chamber has an inlet and an outlet. The sensor is coupled to the main chamber and is at least partially in fluid contact with the breath chamber. The sensor is configured to detect the concentration of at least one gas of a user's breath in the breath chamber. The controller is coupled to the housing and is disposed within the main chamber. The controller is configured to receive the concentration of the at least one gas in the user's breath in the breath chamber and determine a health score.