After reading this I decided to test it out for myself.
At first I was experiencing the same thing as you. I cast my self buff like 3 or 4 times with zero mana loss (at the time my tolerance was like 1 or 2).
I zoned and my drunken state was gone (I think this was the same way on live).
I drank a bunch again, as much as I could and tried chain casting nukes on skeletons and at first it seemed to cost nothing but then my mana did start dropping. I can't quite explain it because I didn't notice when my mana started dropping exactly.
However, it seems like since my tolerance increased the spells started using up my mana.
On a side note I noticed that completely intoxicated i was regening 10 mana per tic exactly where as when I was sober I was regenning 9 mana per tic. (It always drops 1 mana right before it increases 10.)
It's an interesting bug. I might create an alt just to test it out with zero tolerance again.
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