technically you are right, traditional absinthe contains trace amounts of thujone. but if you drank absinthe without thujone and somebody told you it had tons of thujone you would claim to hallucinate. absinthe comes from the wormwood plant. it doesnt need thujone to be called absinthe. its a total placebo effect. read this http://www.absintheonline.com/acatalog/about.html
" In conclusion, there is no evidence that absinthe ever contained the high concentrations of thujone that would have led to detrimental effects or that it has hallucinogenic or mind altering properties. "