I don't give up easily, but step by stepping this is turning out to be a tough challenge. I think I need to clear my head for a few days and come back to it when I'm not frustrated.
This is enormously exciting work, DVap, and some of us are standing by ready to trial it to the letter of instruction.
But as you know -- and as I learned from being raised by a physicist -- science (well, all enquiry) doesn't work in a linear or steady progression, and time away can allow for that kind of mental relaxation and roundabout nonthinking that makes invention possible.
Not to mention you have ample personal reason to spend time away from this for a bit and relieve your frustration.

I didn't want to speak up until I had read the entire thread from top to bottom, and that took a while as graduate school is taking up my reading attention. But this is much too interesting to pass up.
The short version of my background is that I started smoking for "psychiatric" reasons and it probably saved my life. Various health issues (childhood cancer, subsequent PTSD [three words: repeated, coercive, unanesthetized], then recurrent major depression) have given me a layman's interest in pharmacokinetics and pharmacodynamics. Addiction in loved ones has given me an interest in the mechanisms of tolerance and dependence, too. I'm no special snowflake -- we all step in s*** on the road of life, many much worse than I have, my s*** just has diagnostic labels, and I'd like to make the best of it by learning as much as I can.
I take an MAOI. The high-dose, old-school stuff, with the special diet and Medic-Alert bracelet and all that. (The newer antidepressants, SSRI/SNRI/NDRIs, didn't work much or for long. Yes, all of them.)
Interestingly, after about two days on the MAOI, cigarettes began to
pack a punch. Every cig felt like the first one of the day. Dizzying, etc. It let me (well, forced me to) halve my use from 10-15 a day to 4-6 cigarettes a day.
I was already aware of the MAO inhibitor action of tobacco. (It's weaker than the pharmaceutical MAOIs, though.) I'd kind of wondered if taking an MAOI might also help me quit smoking, actually, by providing what I was getting from tobacco, minus the nicotine.
So I've been trying a PV for about six weeks. A few days in, I was down to 2 cigarettes a day. Great! Lovely! These things are amazing! The hand-to-mouth action was soothing and important to switching, too.
Then by week two, I'd tried cutting out all tobacco... and the symptoms just started returning. Depression, anxiety, insomnia, foggy brain, etc. I was actually in denial for a while that it was tobacco withdrawal, because the self-selecting nature of this forum's crowd means so many here rave about how easy the switch is.
Cigs now taste unpleasant and feel less powerful, but I can't stave off these withdrawals. And too much nicotine (vaping over 12mg/ml for me) is a whopper on my CNS.
The point?
PVs and pure nicotine don't have the same full-body buzz, relaxation, and effect that tobacco has, as we know. And it turns out it doesn't substitute perfectly....
even on an MAOI. Or so my experience would indicate for me personally. There's something else there. The alkaloids may be acting in a different area of the brain, or more likely having other non-MAOI action, especially on GABA.
I'm here to find out what those missing pieces are, and how I can get them. This is important. Thanks to all of you for your discussion so far, and to DVap and TB for their experimentation work.
(Apologies for the long autobio. post.

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