Me thinks autoerotic asphyxiation refers to solo play which is by nature the most dangerous form. (It's hard to utter a safe word to yourself when you've passed out but if you did manage to you'd be in no shape to respond appropriately.) When partners are involved I think it's called erotic asphyxiation and in that case it's still full of danger but if you've picked a knowledgeable and trustworthy partner you stand a better chance.
Some speculate that accidental deaths from autoerotic asphyxiation may well contribute to the statistically high number of teenage male suicides.
I'm pretty sure most other forms of breath control play are,
well, more controllable.....

Mad Lews