Methods and apparatus are provided to prevent, treat, and cure chemotherapy induced nausea in human beings. The inhalation of an effective amount of vaporized essential oil from Mentha piperita (peppermint oil) has been shown in practice to prevent, treat, and cure chemotherapy induced nausea. A simple hand-held apparatus provides the vapors to be inhaled through the nostril to prevent, treat, and cure chemotherapy induced nausea.