Is raining dry ice normal or sus?
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The key difference between dry ice fog and smoke is that CO2 is heavier than air...which is why dry ice is used in special effects and Halloween decorations. It tends to stick together somewhat, and will "pour" from a higher elevation to a lower elevation, where it hugs the ground.
Smoke, on the other hand, will rise and dissipate as it is the result of combustion and heat.
I concur with what you said.