I bought a new smoke machine a few weeks ago and today is the first time a spent a few hours shooting with it.
It's a Smoke Ninja, which is much smaller than the machine I had been using and it lays down three different types of smoke, so has a bit more versatility. The smoke fluid is glycerine based, but uses a very concentrated formula, so there is a bit of a residue with this machine.
https://www.icd-usa.com/pages/smoke-ninja
Here's my first effort with it. It allows me to lay a thick "dry ice" look down on my work surface and also has a "fog" and "steam" setting.
Here's my first image using this new tool. It shows promise, but I am going to have to spend a lot more time working with it...