This is for real - it is very easy to sustain lung damage, or develop a severe allergy to the materials, or both.
We get used to the materials and think, "oh, it's just a few minutes and I'll be done..." and overlook shop safety.
As may carpenters have learned, your first accident is minutes after you lose your fear of the tool and take shortcuts.
Please - read up and get the PPE you need before you spray.