Eldritch VapoRub is a magical vaporizing chest rub which is used to treat colds and any other medical issues involving the lungs and breathing. It has been rated "mostly harmless" by the FrobozzCo International Safety Trust (FIST), given that tests have shown it to improve breathing in all conditions (indoors, outside [exposed to allergens] and underwater), but it has been known to occasionally cause areas of skin to sprout pomegranate trees. It is highly inadvisable to eat Eldritch VapoRub.

SOURCE(S): Legends of Zork (zorkipedia)