Artists in the Stone Age Were High at Work, New Study Suggests
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This reads more like a random theory than a newly discovered pattern of behavior from the past.
Direct link to the study: https://www.tandfonline.com/doi/abs/10.1080/1751696X.2021.19...
Perhaps there is no way to make torch small enough to not be deprived of oxygen, but it seems plausible that you'd be fine if the flame was small enough and no one else was there.
I've been in small man-made caves and they are very tiny.
See: https://www.americanheritage.com/alcoholic-republic-american...
Did people build at Machu Picchu for hypoxia?
Nothing has really changed.
That's the complete list of effects of Absinthe besides the unique if not unpleasant taste.
source: drank the real deal a couple of times out of curiosity after it was re-legalized in my jurisdiction