Oy, Absinth - what a cruel and unusual punishment...
The bad thing is not the alcohol but the thujon which is toxic. It´s a hallucinogen which may cause epilectic cramps.
Absinth may contain only 10 milligramme per kilogramme of it, though.
I tried absinth once. It was the only alcohol I drank that evening. I usually don´t get a hangover, even after heavy drinking.
But after this one absinth, I was so wasted the next morning, it was terrible, the worst hangover I ever had. The structure and effects of thujon are similar to THC´s - so I now know what pot feels like - and I have to say I hate it.
Bottom line: give me a nice vodka anytime (or two, or three, or...), but absinth, never again.