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The most common test of potential human toxicity is that of the "LD50" test or the "median lethal dose".
This test is routinely applied to laboratory animals (humans do not usually volunteer) in the testing of compounds used in pharmaceuticals, agricultural chemicals, flavours, fragrances and cosmetics, to name a few.
In contrast, we can say the French "Aromatic Medicine" approach that has developed most strongly amongst French medical practitioners (as well as naturopathic and herbal medicine practitioners) since R. Gattefosse's work in the 1930's, is more of a "physical" approach.
This "French" approach often utilises comparatively high doses of essential oils both topically and internally, to realise dose-dependent pharmacological effects.
If we observe further, we also find that many publications offered for practitioners and health professionals make many of the same recommendations. I suggest that "Aromatherapy" still needs to go beyond being just a "good feeling", fad therapy.