Strictly speaking, the mist does have a bit of effect on He Ao.
He inhaled the mist, but not when he was just speaking; it was when Lin Na took out the gummy bears.
After mastering the ability to project Divine Sense externally, He Ao could perform many more operations, such as covering his breathing passages with Divine Sense, filtering out some of the harmful substances in the air, which although minute, are still physical objects.
Just as the air itself isn't empty, but filled with various gases, isolating these substances is essentially the same as controlling objects through the air.
Of course, most of the time, he wouldn't do this.
Because analyzing and filtering out these tiny things would require a lot of mental effort, and Divine Sense would consume more as well.
However, the mist around him was very thin, so He Ao took the opportunity to practice this new method of isolating harmful substances.
