Inhaling helium to make your voice different may be fun but you really should never do so. Doing so could be dangerous, especially if done to excess. This is due to the displacement of oxygen needed for respiration. Inhaling helium from a balloon is not as quite dangerous as doing so directly from a helium cylinder (the ones you see at stores to blow up balloon).
It could fatally can rupture the tissue in your lungs.
I recommend consulting a local doctor.
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