For me, I found PG = throat hit. VG = vapor. So, I kept trying different percentages (VaporBomb.com offers a larger variety of percentage mixtures) until I found the right one. Having smoked Marlboro Milds, I find 40% VG / 60% PG to be the best for me. My husband, on the other hand, smoked Marlboro Lights, and my VG/PG mix is too high for him (still coughing and sore throat). He'll prob do better with a 40%PG / 60% VG mixture (maybe even lower PG).
I use 24mg nicotine.