Pure wormwood oil is very poisonous, but with proper dosage poses little or no danger.
From the en.wikipedia.org
Wormwood oil often is used to treat loss of appetite and stomach, liver and gall bladder disorders.
From the sciencedaily.com
Studies have shown that high dosages of thujone have toxic effects, including an 1869 experiment in which a guinea pig went into seizures while exposed to high levels of wormwood oil.
From the sacbee.com
At least one documented case exists in which a person suffered acute renal failure after drinking 10 ml of pure wormwood oil, a dose much higher than that found in absinthe.
From the en.wikipedia.org
Pure essential oil of wormwood is poison but, mixed with sweet fennel, green anise and other herbs, absinthe goes way back.