What is the name of the gas you inhale?
air, which is a mix of several gasses
When you inhale hexaflouride gas you voice goes really low because hexaflouride gas is 6x denser than the air we breath... and i don't think you get a headache but when you breathe in helium, you get a headache. From a scale from1 to 10 of a headache from helium, it would possibly be a 5 which can hurt a lot. ^_^
Very. When you inhale it, the gas goes into your lungs and reacts with any bit of water and moisture in there to form corrosive chlorine water, which is when chlorine dissolves in water. This would then just start corroding your lungs from the inside out, which is what causes that terrible agonizing pain you feel when you inhale it.