I have been keeping an eye on my bodies ability to handle nic since I started vaping since I suffer from an extremely rare medical condition called Cholinergic Urticaria With Acquired Generalized Hypohidrosis (say that 10 times fast) and so far vaping does nothing...why do I bring this up in this thread...well, my condition involves breaking out in hives head to toe instantaneously and my partial inability to sweat. So, what I'm saying is that my body is uber sensitive and I'm basically allergic to life itself. I'm not saying that humans can't have allergic reactions to exhaled vapor (despise the term "Second Hand") but just stating that I'm uber sensitive to life and vaping hasn't affected my medical condition whatsoever.
Oh yeah, since I started vaping...it would seem if 24mg nic level is somewhat aiding certain symptoms of my medical condition while smoking analogs aided in increasing symptoms of my medical condition (odd...I know, I am extremely great at observing).
I am not a scientist, allergist, and or dermatologist.
Just my $0.02 even if it doesn't hold any merit.