Does helium make your vocal cords tighten?

Inhaling helium temporarily alters the density of the air you breathe, which can change the pitch of your voice. It doesn't physically tighten your vocal cords; rather, the sound produced is higher-pitched due to the speed of sound being faster in helium than in air. This effect is temporary and reverts once you return to breathing normal air. However, inhaling helium can be dangerous if done excessively or in enclosed spaces due to the risk of asphyxiation.