When running an FFT in a signal from analog input A0, will reading from other analog inputs (not FFT) at the same time cause issues with the FFT? If so... 1) Will they be predictable i.e. only FFT sampling rate changes due to servicing the other inputs, so results are different but usable? 2) Will they be unpredictable i.e. FFT results are garbage and no way to fix them?

I want to simultaneously evaluate one input signal with FFT and the output of several filters.