Experts tell us that the body's response time to the inhalation of essential oils can be as quick as one to three seconds. This is one of the reasons many people prefer this method. Essential oil inhalation tends to increase the production of endorphins (the body's natural pain relievers and mood elevators) as well as neurotransmitters and antibodies. This dramatically boosts the immune system, creates an overall sense of well-being (either relaxation or stimulation, depending on the oil) and increases the general state of health of the individual. Oils also inhibit the reproduction and growth of airborne pathogens which can dramatically reduce your exposure to colds and flu.