Strange sounding question, I know. When I first started vaping 5 years ago it took me some time to realize my body really wasn't much for tolerating VG. Since then I opted for 70pg/30vg and things seemed to get better. I've found different vendors to have varying e-liquids in terms of harshness on the lungs (primarily coating them - and causing phlegm). Who here has used a ton of vendors? Any opinions on who has the "cleanest" stuff? Thanks.