Hi:
This subject has been kicked around for a long time! The opinion that I have gleaned from all of it was to never fire these things!
Of course there will be those who insist that they are safe but it is your brain! Why take the chance?
It reminds me of the smoker who claims that smoking is safe by stating that he knows of a smoker who is 95 years old and it has never hurt him!
These things come up for auction around here for about $135.00. If you wish, buy one and take a walk on the wild side! Lol
Be well,
Franchi