Smoke animation in after effects (2022)
1. Set Key frames for 'Position' Property 
2. Set Key frames for 'Scale' Property
0%, 100%, 0%
3. Duplicate it 4 or 5 times
4. Position,scale loopOut("cycle")
5. Duplicate smoke layers
6. Pre-compose -> Rename Smoke
7. Add Fast Box Blur, Curves (Check Alpha)
8. Delete solid layer
9. Move smoke layer
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