@brdross I am an artist too with asthma, and for years I could not oil paint with artist groups when people were using turpentine. (I also paint in watercolor.) Paint thinner and "odorless" thinners made improvements, but if you have reactive lungs, that can still be an issue. I gave up oil painting for a number of years to this, but now artists use walnut oil for a painting medium and no solvent thinners. I also found a painting gel medium that is some alkyd and some oil, so it is solvent free and I use that while painting. I don't bring out the odorless thinner at all until I clean up and I do that with a respirator on, and then it is recapped, and all the used paper towels are put in a plastic bag and tied shut. This has been good enough since I paint at home in a dedicated spare bedroom and I close the door.

Sue made a good point that it is in disturbing things are stirring up dust that causes exposure to bacteria that may be present, or if it can be atomized into water droplets. This is why I don't use a "cool mist" vaporizer, and instead, if needed, use one that creates steam by heating water, because that water is just water that changes phase from liquid to gas and doesn't take impurities with it. This is how they make distilled water which when the vapor is condensed again it becomes pure water. Of course watching humidity levels is important so you don't promote the growth of mildew. I also use HEPA filters in standalone units that also have activated carbon to absorb impurities in the air. Keeping those filters changed regularly and furnace filters is important so they don't get overloaded and start shedding airborne dirt. These filters are good enough to take solvents out of the air and I run that in my art studio.