My group ended our last game rather abruptly, but my players warned me about their plan to use control weather in the upcoming session to blow away the smoke that was in their way (which I unfortunately forgot until now, a few hours before the game.) The problem is that they are underground and the source of the smoke is not natural.
I'm figuring that if the spell can control wind, that can blow the smoke away or maybe thin it and increase the visibility range. The problem is that I'm not convinced this spell works underground. Is there such a thing as underground weather?