No, it's definitely not normal or there wouldn't be so many people doing it.After putting pure VG on my atty...ONE DROP (with two drops of 80/20 blue punch juice) within 5 minutes or so I got an upset stomach and ended up on the toilet lol...let's just say it "induced" having to go. Is this normal?
I guess the best way to find out if you are "senstive" to VG is to try it again later.
Unless it happens repeatedly, it is just a coincidence.