I got that impression from my reading as well, and was glad to hear it.
My titanium wire has yet to be delivered, and as this was my first TC mod and 26g Ni200 was all I could find locally to play with for TC, it is all I have experience with this far.
I'm not saying nickel is definitely harmful to vape with, I just choose to use a different medium for my own piece my mind. That's why I ordered Ti, but needed to try the TC function of my mini while still within my return window, and Ni200 was all that was available.
Not trying to open that debate here, just my personal preference.