Here you can see how smoke/fog may look once vectorized. Please be aware that smokiness is another effect that cannot be done in the vector format as it usually requires bitmap effect. The artist has used a combination of complex gradients to achieve the look seen in the below “Vector” version of this artwork.
If you need something with about as much detail vectorized, you should always get a quote and opinion first before proceeding.
You can upload a quote for a speedy and efficient process here: Here (no account required).