The essential oils in eucalyptus are also used to treat colds and coughs. The cineole contained in eucalyptus leaves loosens the stuck mucus from the bronchi and paranasal sinuses and promotes its removal. This makes coughing easier. The vapors from eucalyptus oil are very effective. To do this, add one or two drops of eucalyptus oil to the bowl and pour a liter of boiling water over the oil. With a towel over the head, the vapors are inhaled up to three times a day. Breathe in and out calmly.