[OldRestorer]

You will have to strip and refinish. When toner spits it is usually due to not wiping the nozzle clean every few minutes. Never wipe off toner spits or runs while wet. you can try sanding them out when dry but it usually ends up in removing too much toner and then again having to strip. Once a toned area is wiped and the wood underneath is visible it will never tone to meet the remaining toner color.

The mist is not a problem and not something in the air. If you are sanding between coats (very lightly watching especially on the corners)
It will work out fine. The mist is just lacquer overspray and will adhere to the next coat. When you apply the clear it will automatically adhere to the whitish mist on the cabinet and fade away. I usually just wipe off the mist with a brush between coats. Sanding between coats will make it a lot easier to get a perfect flat finish without breaking your arm trying to do it all at once.

After the last coat you should sand to 2000 grit or more for a really fine finish. You want an even, dull finish when the cabinet is prepped and ready for polishing and waxing(if desired). I smooth the finish and then rottenstone the cabinet or use lemon oil and rub it in with felt wrapped around a piece of wood for a semi gloss shine. Then wax with johnsons paste wax in the yellow can. Very thin coats and buff it out to gloss. If the finish is uneven and has shiny spots after sanding, the spots will retain their shine but will always be visible.
Unless you want to add 40 coats of wax.

High number wet/dry sand paper can be purchased from auto stores and rottenstone can be found at constantines and the like. Otherwise good old lemon oil works great for a shine.