About all I can add to your question is that I have found that the PG just irritates my throat too much. What I mean is that "throat hit" is one thing, but when it causes my throat to get a bit raw and irritated then it's not a good thing. So I've learned that VG has a much better and soothing effect on my throat when I vape.
For example, I have some 25mg strength
Marlb flavor that I got from RMV (Rocky Mountain Vapor). I love the flavor but the PG in it is just too much. So I take that 24mg juice and fill a 6ml container half full of it. Then I fill the other half with pure Wilton brand VG. I have purchased the Glycerine USP from Wal-Mart, the straight VG liquid from 2 sources online have found that the Wilton VG is the sweetest of the bunch which really helps cut the "bitter" or "harshness" from any flavor/juice.
So I end up with what I believe to be a 12mg strength solution of e-juice which is
much easier on my throat but yes it also has lost the full-strength flavor of the original 24mg Marlb. But, this works perfectly for me. Number one, I have been cutting down my nicotine strength in all my diy juices to about 12mg anyway, and the number two, the flavor is still good enough for me to vape all day without any problems.
I've actually talked more than a few people into at least
trying PV's and there was on lady who said that her daughter told her that the PG (Propylene Glycol) is used in anti-freeze and the FDA says it's not safe, etc. (we've all heard that argument), but I told her that she can get her e-juices with no PG and this has convinced her daughter to basically leave her alone, so she's going to give it a try. Not all vendors have pure VG-based e-juices, but you can make your own too - that's what I now do.
