i used to paint all the time with holdyourbreath ventilation and sometimes filteredlitcigarette ventilation, but it depends the solvent-paint system used, probably enamels being slightly less flammable
dont turn the fan UP or you will gets megadirt in the paint-
think gentle calm and wait for the cloud to disperse if you can, and have a good filter on your paint gun air, preferably next to the gun...
watering the floor could help both cleanliness and flammability

go out and take a breather or have your own air supply for breathing (big aquarium airpump laying around for a supplement?). a carbon filter respirator helps lots too