Yes, it would take high usage for a long time to cause serious health issues unless you're already B12 deficient, and it seems that most of the diseases caused are reversible after stopping and taking B12 for a few months. Still, unless you're a trained anesthetist how are you going to know how to safely administer it with the right amount of oxygen? And I've read several near death experiences which were caused by nitrous huffing. In other words, it killed them. They just happened to get sent back into their bodies because the Being of Light said it wasn't "their time" yet. It's pretty easy to die on nitrous.
This is DEFINITELY false.
I don't know where you are getting your data other than a couple random accidents.
If Nitrous were a serious health threat to the public we'd have heard about A LOT more deaths and brain damage and it would probably be banned now.
I really think you don't know what you are talking about when you say this and you already admitted that you have very little experience with nitrous and that you don't know much about it.
I doubt there's even ONE death per year from nitrous usage in the U.S., and assuming that there is...the number would be VERY low....CERTAINLY way under 100 people per year...and that's NOTHING in comparison to other drugs.
As long you don't go crazy using chargers for an hour or more straight and take breaths fairly regularly and don't usage nitrous more than once or twice a month max, you aren't going to be very likely to do yourself long term damage.
Dying on nitrous is VERY hard.
In order to do it most people would actually have to TRY to be overly reckless.
My guess is that if I bought a whole shit load of chargers and TRIED to overdose and commit suicide by way of nitrous that I would have about a 90% chance AT BEST of failing.
I'd probably just pass out and kill a whole shit load of brain cells and not feel well for a few days.
If something isn't a feasible means to committing suicide it's probably not easy to have an accidental nitrous overdose like you are saying.
It's FAR easier to overdose on alcohol, and even that isn't quite as easy as some might say unless other CNS depressant are involved or you are determined to drink yourself to death like some kind of "Leaving Las Vegas" scenario.
Nitrous is by and large a FAIRLY safe drug, but with dangers like most others drugs when taken too far...so basically...if you want to do it, you will probably be fine, as long as you don't go totally crazy.
You are making false assumptions based only on the very worst stories you've heard and that can be done with most drugs if you look for the horror stories.
I know someone who ended up in the ER from heart palpitations from drinking too much Iced Tea and that might lead me to believe Iced Tea is a dangerous drug, but it isn't.