100% PG used to irritate my throat. After trying it again and again over time, suddenly I could vape it. It still depends on the particular flavor mix. Some have more throat hit than others.
Some of the more popular juices are 70pg/30vg, 64/40, and 50/50. VG is thicker and more likely to feed slow in cartomizers, which like thinner juices. You might like 50/50, which is OK in an eGo-T tank or a dripper atty. Water and pure grain alcohol are also added to juices to thin them. It's not completely the presence of PG or VG that determines the final viscosity.
If you use the Contact Us menu on your supplier's web site, they will tell you what the mix percentage is for the juice you like.