Lavender oil is widely used for various respiratory problems including throat infections, flu, cough, cold, asthma, sinus congestion, bronchitis, whooping cough, laryngitis, and tonsillitis. The oil is either used in the form of vapour or is applied on the skin of the neck, chest and back. It is also added to many vaporizers and inhalers that are commonly used for colds and coughs.