Due to its low density, helium gas from balloons can briefly alter the pitch of your voice, making it sound higher. Helium, however, replaces oxygen in your lungs, which, if used excessively or improperly, can cause oxygen deprivation. Dizziness, lightheadedness, and even unconsciousness may result from this. Helium from balloons should not be inhaled and should be avoided at all costs. Prioritise your safety and refrain from breathing in anything that can prevent you from getting enough oxygen.