You don't have to worry about fatal asphyxiation if you're sucking from a helium balloon at a party. After inhaling helium, the body's oxygen level can plummet to a hazardous level in a matter of seconds. In other words, each breath of helium you take sucks more oxygen out of your system. ![]() ![]() ![]() When the gas fills your lungs, it creates a diffusion gradient that washes out the oxygen. If you couldn't breathe at all, you'd start to die in minutes-as soon as your body exhausted the supply of oxygen stored in the blood. Breathing in pure helium deprives the body of oxygen, as if you were holding your breath. Is helium really that dangerous? It can be. ![]() The week before, a 10 year old in New Jersey collapsed at a birthday party after sucking helium from a balloon. On June 3, the bodies of two college students were found inside a giant helium balloon in Florida.
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