If it is unlikely for nic to be addictive why are (at least the online communities of) vapers panicking and stockpiling liters/gallons of it? A non-addictive substance is something you can easily do without but there has been thread after thread of how and what to stockpile, nic being at the very top of the list. If it is not addictive I don't believe we would be seeing people panicking and stockpiling nic (DIYers and non-DIYers) or stating they are afraid (or would) go back to smoking. Every vaper could drop to 0mg nic with no issues, vape non-nic eliquids and be fine to keep vaping instead of smoking.
I like your logic so let me offer these thoughts:
1. No need to stock up on anything if you can stop vaping. Start today and see what happens.
2. If you wish to transition to zero NIC ejuice and continue to vape then start today and see what happens. Even if you are fine with zero NIC ejuice your still vaping so get some NIC and use it as a "currency" to barter for other supplies
3. I suspect, but I'm not a scientist or MD or a shrink nor due I wish to debate weather x, y, or z is in fact "addictive", that "most'" of us enjoy the sensory experience, holding the mod, and the absorption of NIC into our bodies. Respectfully, if I or you enjoy this then who cares weather the almighty powers will label me or you addicted to NIC and or Caffeine. I enjoy BOTH and I'm not stopping!
4. I recently had a full physical which required me to fast so no Caffeine via Coffee in the AM like I always do. I was "foggy" and not as alert as I normally am after my fix of coffee. I was still vaping. I've also switched it up and no vaping in the AM but Coffee and I was still "foggy" so I need both. They are both beneficial to me and I have no adverse effects to either one. I'm old like very very very old /lol and still "sharp as a tack" and a significant part of that comes from NIC + Caffeine. I'm just saying and not intending to boast and I've been tested for my mental acuity.