Helium is one such gas. Sure it makes your voice all squeaky, but that’s because it’s forcing oxygen out of your lungs. The same goes for carbon monoxide– when you breathe that it, it wants to bond with extra oxygen molecules to form carbon dioxide, thus actually draining oxygen out of your body instead of supplying it as is supposed to happen when you inhale.
Ozone (in the troposphere, near the surface) is harmful to humans. Exposure to ozone may cause lung damage, chest pains, coughing, nausea, throat irritation, and congestion. Ozone exposure may also worsen bronchitis, heart disease, asthma, and also reduce lung capacity.
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