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This is a paid asset, but now you can download Realistic Smoke VFX Free.
Detail this asset from Unity Store: Original Link
Realistic Smoke VFX v1.6
A collection of 9, high quality but performant, realistic smoke particle systems. Ready to drop into any scene.
Package includes:
Thick black smoke
Thick blue/black smoke
Thick red/black smoke
Thick white smoke
Thick smouldering area smoke
Chimney smoke (residential)
Factory Chimney smoke (white)
Factory Chimney smoke (yellow/chemical)
Low mist/Dry-ice
Each system looks great but keeps particle count relatively low so they can be used on mobile.
All easily editable in the inspector.