Inhaling helium in small amounts for a moment, such as when using it for party balloons or voice effects, is generally not fatal. However, helium is an asphyxiant; it can displace oxygen in the lungs, leading to asphyxiation if inhaled in large amounts or in confined spaces where the oxygen concentration is low.
Specific quantities that might be considered "fatal" can vary widely depending on individual health conditions, the environment, and


