I have a lot of allergies and almost gave up on vaping. I have to have 1OO% VG including flavors. It's not a choice. I am also allergic to something else and I suspect cinnamon. My mouth will break out to the point of needing a doctor immediatley.
similar here. I have bad reactions to ingredients in many flavorings. Mouth puffs up inside and sore throat and lungs from less than 1 day of vaping many/most commercial ejuices and the majority of flavorings.
PG is no issue, VG over 60% has me hacking up VG.
I have no real other allergies. Heck even posion ivy does not bother me.
But when I switched from cigs to vaping had I not found 1 gas station Chinese tobacco juice that I could vape I was going back to smoking and saying F vaping.
within 6 weeks I was doing DIY. First with all natural extracts and no issues with them.
I have since tried many other flavorings and tossed about 2/3 of them.
I learned that the first signs of a juice that would hit me bad was tingly lips after a few draws.