As another EIA sufferer, I can only emphasize that you should take what you need, when you need it. I used to only take a “hit” when riding in the cold (when my EIA would really flare up), but now use it before any ride / session at or above SS.
About 2 years ago my primary doc made the observation that I was only depriving self of oxygen by not using the inhaler….and she was right.