Maybe this post is relevant here. Haven't read the whole thread but if you're trying to get some results concerning possible toxicity in modern vapes I'd love to know as well.
If one is concern about not breathing nickel ,better hold your breath while you are using your hairdrier or space heater.lol... For a fact people were using hot air guns with glowing nichrome elements,not saying i would do it,but to my knowledge no one died from it .