I was a 3 ppd smoker. I used 18 mg nicotine salts, and WTA for me was super helpful, I bought the wholesale variety (from Aroma) and would just put tiny squirts in my tank, which was good.
I know this is a "vaping" situation, and I did pretty well quitting while vaping, I was a chain vaper like I was a chain smoker, which meant that I pretty much had a vape all the time.
I went back to work (my health was pretty dire when I got here, to quit land) and I really did NOT want my work to know I was a vaper, and I decided to try Swedish snus. I can go twelve hours or longer without vaping once. Snus is equally or even more so harm reduction as compared to smoking. I made the commitment I was NOT going to be seen vaping or smoking at work (it's a new job) and I also find that snus has more alkaloids in it than vaping unless you are really going to be using a TON of WTA. I also moved into a small apartment a week into my job because the commute was impossible. I really found myself being able to withstand stressors that otherwise may have made me smoke, and I don't have the urge to constantly vape.
Swedish snus is sold here under the name American General. I'm just mentioning it in case it might be helpful to you. I still vape in the mornings, the evenings, and on weekends. But if I'm engaged in an extensive chore I will more than likely abandon my vapes and use some snus. It's easy, it's convenient, I don't have to take vape "breaks."
Just a thought. You can quit by vaping only too, which is what I did the first time. I had a pretty strong motivator (I slipped up here and there early on) of not wanting to get COPD and having pneumonia for pretty much 18 months straight and drowning in your own fluids was horrible.
Quitting was not easy for me even with WTA, and as has been stated, there is no special "gear" "flavor" or "juice" that can make you magically quit. YOU HAVE TO develop a quit plan. For me it was ridding myself of that first cigarette, because it was my hardest, and I knew I would smoke all day if I didn't. I just pushed it out further and further, and eventually quit, but that is what worked-- for me.
So, you really have to examine your motivations and needs and find the right nic LEVEL (and maybe WTA) and stick to a plan.
You will hurt, given what you have said of your history with vaping. I was a vape dilettante for a long time (vaping only when I couldn't smoke) and I really had to face the fact that I was going to HURT to quit.
The rewards have been immense, and my trail has not been perfect (had kind of a terrible relapse after one year, which was much harder to halt in some ways as my body has recovered.)
However, it's short term pain. You can decide if you are willing to undergo it. Pain is not optional (if you are not that magical unicorn of vape with no issues from that first puff) but suffering IS OPTIONAL and that, for me, meant I put more energy into learning Every Last Thing about vaping I could while I underwent the pain of quitting.
Then I got to experience all the joys of vaping: building, DIY juice, all sorts of stuff. You get out of vaping what you put into it, and I was such a dependent smoker I had to put ALL my energy to vaping.
Best of luck to you the choice is yours to make, or not make, but NO ONE can undergo your quit experience other than YOU and it will be what it IS, and you can decide to be an enthusiastic participant, or to keep smoking.
Anna