I bought PG/VG 80/20 when I first started. I had tightness in my chest and terrible itching on my legs and arms. I read on ECF about allergies some people had experienced. I changed and can now
vape 50/50 without any irritation. I like VG better as it produces more vapor. Also, after 1 year, your lungs will look almost normal according to my doctor. As far as damage done to them, no one knows.