Nichrome ought to be OK or there would be lots of horrible health stories about people being poisoned by their electric fires - this is usually the material used to wind the elements. Some people use nothing else for vaping and if there had been any issues we'd almost certainly have heard of them by now.
Nickel isn't exactly good for you either. As long as the surface doesn't show any signs of erosion (This goes for any wire) it should be OK. If it does almost regardless of composition, then don't vape it.
Delivering finely divided metals into your lungs mean it is in its most bio-available form. This is not good.
Nickel isn't exactly good for you either. As long as the surface doesn't show any signs of erosion (This goes for any wire) it should be OK. If it does almost regardless of composition, then don't vape it.
Delivering finely divided metals into your lungs mean it is in its most bio-available form. This is not good.