>>26813464Yes. The part of your brain that registers suffication (and the associated panic) is triggered by the presence of CO2, not a lack of oxygen. If you're breathing a different gas you'll still die but it'll just feel like passing out. It's why carbon monoxide is so dangerous, you're suffocating from a lack of oxygen but your body doesn't register it.
That said, after helium became a popular method of commiting suicide some brands that sell tanks starting cutting it with oxygen, so make sure to check that if you're using that message. Too high a percentage and it won't kill you.
Also please don't kill yourself if you're actually considering it. I don't want anyone to die, I just think if you've already decided to you deserve the facts to go out comfortably.