Hi, I have a question my brother wanted me to ask. He has been vaping for awhile now. He started vaping 50/50 and it was tearing his mouth up, then he switched to straight vg and it is started to do it again, when I say tearing his mouth up it's eating at his gums and like making a little hole in his tongue does anyone know what he can do? Is he allergic to PG or VG or both? Thanks
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