Interesting to note that the checklist only calls for the 'smoke evacuation handle' to be pulled when the smoke is severe and source considered to be from the flight deck. I doubt the cord from the Eros mask would allow you to reach it. Leaving your seat to reach the handle at the back of the overhead might be the last thing you do. Very nasty situation, I cannot feel anything but sympathy for these guys and I hope we find out the cause.