VG is naturally very sweet.
This is from a user Plumes.91 at this
thread
http://www.e-cigarette-forum.com/fo...cussion/521330-taste-pg-vs-vg-less-sweet.html
"Wings is correct, Vegetable Glycerine is considered to be sweeter than Propylene Glycol. Propylene Glycol is dry, and can develop mild, dank, mildew type flavor profiles and that can also bloom into a slight tartness. Vegetable Glycerine can have tones of corn syrup, &/or refined sugar. Neither of them are strong in flavor once flavors are mixed into them, but a refined palette may be able to pick this up.
VG is also much thicker, creates more thick a vapor than PG, mellows the
throat hit, sometimes making the TH feel spongey & muted, and it can irritate the lungs causing wheezing & feelings of heavy chest in some vapers. PG is much thinner, can produce a bit of a
throat hit, and can irritate the upper respiratory system, including the throat and esophagus & can produce sore throat and esophagus.