Mary,
While I keep hearing that PGA adds to TH, I've not had it happen to me as of yet.
It can add some warmth and can brighten some flavors, but I have yet to have it add TH.
There have been some banter on what PGA is doing in the atty, but I don't know what is going on exactly. I would assume that if the atty is evaporating it and I am inhaling the evaporation, then I would be consuming that tiny bit of PGA.
I cannot imagine that I would
vape as much alcohol in a day than my liver naturally produces, but have never even tried to measure it.
If you are needing TH without the nic content, you might want to try the harsher flavors.
(There have even been some experiments with pepper extracts to up the TH, but I've never tried it.)