Impendance isn't a term associated with DC circuits... There is no phase angle with direct current. Therefore, your impedance will always be zero.
Get things right if you're wanting to try to blow the minds of new comers or non-tech savvy people.
I realized that after the fact, I work with a lot of high frequency AC so the wrong term was in my head at the time. As a side note it was never my goal to blow anyones mind, I would have just been ecstatic if I had some of this info when I was in my quest for the perfect vape, pre-built coils are almost more of a pain than building them yourself because what you buy is what you get and there are no solid rules of thumb here that apply to every coil type.