Aromatherapy has been used for many centuries. It is a method for soothing the body and mind. Essential oils are distilled from plants, flowers, trees, roots and herbs. These oils have a comforting smell that can be used for medicinal purposes. The theory is that the sense of smell sends chemical impulses to several parts of the brain. The positive effects of pleasant scents may reduce anxiety, some skin conditions, pain, blood pressure, headache and cigarette craving. Currently no research supports aromatherapy for sinusitis or allergic rhinitis. However many popular respiratory products with aromatic smells are widely used for upper and lower respiratory conditions. Such products include Vicks® VapoRub® and Tiger Balm®. These products may include eucalyptus, menthol, anise, fennel and tolu balsam.