  Neutron star high mass X-ray binaries with superorbital modulations in
luminosity host warped inner accretion disks that occult the neutron star
during precession. In SMC X-1, the instability in the warped disk geometry
causes superorbital period "excursions:" times of instability when the
superorbital period decreases from its typical value of 55 days to $\sim$40
days. Disk instability makes SMC X-1 an ideal system in which to investigate
the effects of variable disk geometry on the inner accretion flow. Using the
high resolution spectral and timing capabilities of the Neutron Star Interior
Composition Explorer (NICER) we examined the high state of four different
superorbital cycles of SMC X-1 to search forchanges in spectral shape and
connections to the unstable disk geometry. We performed pulse phase-averaged
and phase-resolved spectroscopy to closely compare the changes in spectral
shape and any cycle-to-cycle variations. While some parameters including the
photon index and absorbing column density show slight variations with
superorbital phase, these changes are most evident during the intermediate
state of the supeorbital cycle. Few spectral changes are observed within the
high state of the superorbital cycle, possibly indicating the disk instability
does not significantly change SMC X-1's accretion process.
