Our experience with .9% sterile saline solution:
We make a base solution of 80% VG; 9% distilled water; 9% sterile saline (.9% solution) and 2% PGA
We have made (literally) hundreds of samples...with 18% distilled water (no saline) and with 9% dw and 9% saline (.9% solution). We also made dozens of samples with all manner of variations - all with a base of 80% VG
In all but a handful of samples, the flavor was definitely 'more intense' with the saline. (Frustratingly, as newbies when testing, we didn't write down the ones that didn't intensify - we were only interested in "majority rules" :::grin::
Neither of us could taste the salt in any of the samples (via vaping). Neither of us can taste the salt in any of our mixes (nor can the handful of others that have sampled them).
Our mouths, sinuses, lungs (and even eyes) are less dehydrated
We have never found a 'negative' (like "coil gunking", flavor diminishing/changing, etc) due to the saline
However, we
think we may have noticed when we mix EM powder in our base at 10% (to make a 10% EM solution to use as an additive), it may tend to recrystallize faster than in straight VG (due to the salt?)...but we haven't yet done a side-by-side to compare (it doesn't matter to us, because it always stays completey dissolved in our juices). The 2% pga may also be a factor there (or the mix of the two).
Also fwiw...
We will not use or inhale Splenda. Independent research (not mainstream, but even some mainstream) shows many different adverse effects on the human body. The newest data reveals the creation of some dangerous carcinogen/chemical (dioxin?) at even moderate baking temperatures. It's not for us.
Agave "nectar" is basically the same as corn syrup...only made from agave. It was hailed/marketed as "healthier" until a few researchers dug in and found it was processed almost exactly like corn syrup. Of course, the rumor of 'healthier' still persists.