Helium gas is generally safe to use. It is an inert gas, meaning it doesn’t chemically react with other substances, which makes it non-toxic. It's non-flammable and does not pose the risks that gases like hydrogen or methane do, which are highly flammable.
However, inhaling helium directly from a pressurized container can be dangerous. It can lead to suffocation because inhaling pure helium displaces oxygen in your lungs, and if you don't have enough oxygen, it can cause dizziness, fainting, or even worse in extreme cases.
As for cost risk, helium is a finite resource and can be expensive due to supply constraints, especially as it is primarily extracted from natural gas reserves. However, in terms of safety, there's very little risk associated with using helium in everyday circumstances, such as filling balloons. Watch this Helium Balloon Experiment to learn more https://www.youtube.com/watch?v=yMqYQKMmd3U
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