Aromatherapy oils are made by extracting the natural oils from various parts of plants. Typically, steam distillation is used to produce the oils. Steam will run through the plant breaking down the cells that carry the oil. The oil and steam are then carried to a cooling chamber where they are separated resulting in the capture of the essential oil.
Essential oils that are inhaled into the lungs offer both psychological and physical benefits. Not only does the aroma of the natural essential oil stimulate the brain to trigger a reaction, but when inhaled into the lungs, the natural constituents (naturally occurring chemicals) can supply therapeutic benefit. Diffusing eucalyptus essential oil to help ease congestion is a prominent example.