Thanks! Can you elaborate more on your 'smoke not working' point? It didn't work out the way I had envisioned, but I'd like to see if we're thinking the same thing.
Part of the answer to your question is do you want smoke (dynamic) or do you want fog (static)?
Having had a lot of up close and personal encounters with smoke my observation is that it's very dynamic, always moving. Combustion heat causes it to rises until the temperature cools to the ambient air temperature, then recedes,to be replaced by more coming up. As it's made of gases, and unburned organic compounds the colors will change and vary as it moves, depending on the density of the organic compounds within.
Fog on the other hand is static, it lays there unless it's moved by air currents. Comprised mostly of water vapor, there isn't much color difference unless it would be caused by light diffraction. Think color gels in a stage show.
As to opinions on the shot, I feel a little like I'm schooling the teacher, because your experience level, knowledge and ability is so much greater than mine, but here goes. If I was using smoke, I'd envision a combination of subtle and dramatic changes to the flower as the smoke wafted around it, from softness, to color, to saturation. I'd also envision some areas of the flower peaking through sharp as a tack, with no changes to color or saturation. If I was using fog, I'd plan to include all of the vase, and have it emerging from the depths of the fog, maybe even have the fog up to and include part of the flower, with faint glimpses of the vase within the fog. The difference from the smoke is that I would see a gradual transition from soft diffused look to in focus detail on the flower.
And as a disclaimer: I've tried both smoke and fog on different occasions, and haven't gotten it totally right yet, came close a couple of times, but no cigar.

Looking forward to what someone who knows what they're doing can produce!