I seen mentions of both, but no real before and after comparison / the differences between not using it and using it. I don't know if I'd add salt to a juice, but maybe there's something someone knows that I don't (I honestly only know what I find out by trial and error - best way to learn, IMO).
I'd be interested to hear your take on Skittles before and after and if you do try saline, to know what you added it to and how well it works for you. I'm not sure what I'd even think of adding saline to

.
You can learn more about using saline in this thread (starting around Post #49)
http://www.e-cigarette-forum.com/forum/diy-e-liquid/268760-diy-master-techniques-flavor-add-ons-em-vw-bw-mts-acv-ect-2.html#post5559578
We use a 'base' of 80% VG; 9% distilled water; 2% PGA; and 9% Sterile Saline (.9%) - for all of our juices (and for 'flavorless' vaping).
--You cannot taste the salt
--It helps to hydrate the mouth (substantially)
--Saline solution/vapor is used for all manner of "lung treatments" (with or without added pharmaceuticals)
--It makes the flavors *POP* (in a major way) - particularly chocolates, bakery, and most fruits
--It is tank/coil friendly (use only .9% sterlile saline solution without 'salt impurities')
There is absolutely no doubt in our mind that it is used by many e-juice vendors - and that it is the missing element in many DIY juices.
We get it from our local mom & pop pharmacy (around $6 per liter), but it's available on Amazon (just search for .9% saline) and you'll find dozens of options/sizes. It's commonly used for irrigating wounds - and no matter what is written, it does NOT require a prescription :::sigh:::
Some folks say it doesn't have to be used at 9/10% to cause flavors to *pop* (which may be true) - but we're diluting the VG anyway to make it thinner...so why not have a wetter mouth and the lung benefit (when we can't taste the salt anyway, and every flavor we've ever tested it with has been enhanced)?