Oxygen depletion is the issue.
No O2=death. A few folks have done this and died. It's not from the buzz you get, it is from passing out and not getting oxygen in your lungs. Freon is heavier than air so it lays in your lungs at the bottom.
Stay alive. Don't breathe freon without someone around who is on oxygen and can get you away from the freon and into the air when you pass out.
lc