PG is an alcohol. It is hygroscopic. It will absorb water. Even at "max VG" most commercial juice I've seen is only 80%. Even with 95% VG, I still have issues with PG.
The way body reacts, the PG will absorb the water, and the VG will coat the surfaces which act like chap stick on chapped lips, making them feel moist, but actually preventing moisture from returning osmotically to the tissue. I only vape about 30-35mL a day though.
Propylene glycolReally? I never heard this before, that might explain the throat irritation then from all the damn vapor.
From Wikipedia, the free encyclopedia
Propylene glycol (IUPAC name: propane-1,2-diol) is a synthetic organic compound with the chemical formula C3H8O2. It is a viscous, colorless liquid which is nearly odorless but possesses a faintly sweet taste. Chemically it is classed as a diol alcohol that is miscible with a broad range of solvents, including water, acetone, and chloroform. It falls within the same class of compounds as alcohols.[4]