Camphor oil is one of the oldest known remedies for bronchitis, and remains an important for option for those suffering from this condition because it works on congestion and inflammation throughout the body. Camphor oil is commonly included in salves and rubs for respiratory infections due to these powerful effects. Simply spread camphor oil on the throat and chest before going to sleep; this can stimulate coughing initially, to expel the excess mucus and phlegm in the respiratory tracts, but this is a good way to eliminate the environment in which bacteria can thrive.