Over the years, many previously approved food dyes have been banned for various reasons, some quite serious.
I think it is possible that some vapers who report having allergic symptoms to vaping, wondering if it is the PG, VG, nic level, flavorings, etc etc, should be encouraged to consider if their symptoms could be related to the use of dyes in the eliquid that they are vaping.
Food coloring sensitivity seems to be the one stone that remains unturned.
Yeah..That could be a possibility! I hadn't thought of that. When I first started vaping, I thought I was having a sensitivity to the PG (the liquid I had was a 70/30 PG/VG blend) but it turned out to be my spring allergies in full force! I am so glad it wasn't a sensitivity...the 100% VG liquids I have tried haven't been great and I really enjoy the vaping.