If you have cone from smoking analogues a sore throat or persistent recurrence of a sore throat can be quite normal for a month or so. Regardless of if you vape or not. But any concerns over it you should always see you doctor for a check up .
As others have mentioned VG is vegetable glycol or glycerine you can get it at any pharmacy as it is a thick very sweet liquid, usually the main ingredient in a cough syrup, that is used for sore throats, burns etc.
VG is usually mixed at a ratio of 85% VG to 15% distilled water which makes AG or aqueous glycerine. This is actually what's used in liquids but its just reffered to as VG
I personally don't use much of it so don't bother mixing AG I just use a lesser amount of pure VG. If you are getting it make sure its glycerine bp which is pharmaceutical grade so there's no additives in it
Since its used for sore throats it takes away some throat hit and is smother but you will quickly adapt to this and find it the norm.
I had a sore throat after using ecigs for about 2months on and off but one after the other. I was using red label tobacco which I found quite strong. I switched to a different range which was a little smother but after about 2 months I was fine and never had a sore throat since. I think its just your body getting used to something new as its a common comment on ecigs.
Another helpful tip is make sure you drink plenty fluids that will also help while your body adjusts. Plus its good for you so overall you will feel better
Hope you stick with it as we have all been there