The properties of helium (He):
Helium is a very light gas. It is neither flammable nor toxic. Helium is odorless, invisible, silent and insensitive. It is seven times lighter than oxygen. This is why, when inhaled, helium remains present in the lungs and in the blood, which risks seriously complicating the transport of oxygen. Indeed, the helium inhaled takes the place of oxygen in the lungs.
The Dangers of Helium (He):
Breathing helium can cause reduced mobility, unconsciousness, asphyxiation, and even sudden death. Loss of consciousness can cause respiratory arrest, and therefore oxygen starvation to the brain. This can lead to irreversible damage to the central nervous system, causing lifelong paralysis or death. Even the brief breath of helium can lead to asphyxiation without the victim realizing it.
Warn others of the dangers of helium (He):
Conscious breathing, inhalation or ingestion of gas is always discouraged. But this is especially true for helium! When you see someone doing it, warn them of the dangers.