True, large doses of eucalyptol is toxic and may even be lethal. However, this applies to absolutely everything, including water. The potentially lethal dose for eucalyptus oil (which has 70-85% eucalyptol) is 0.05 mL to 0.5 mL per kg of body weight. For a 80 kilo adult, this means between 4 and 40 mL of eucalyptus oil. The toxic dose will be considerably higher for any variation of elemi oil, which usually have only a few percent of eucalyptol.