When you inhale helium from a balloon, do you weigh less?
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No, you don't. You're adding more mass to your body. However: not as much as you would when breathing air
You are adding more mass to your body, but you are also decreasing your body's density. So this should in fact make you lighter on the surface of the earth.
Buoyancy is a thing, even in the regular old earth' atmosphere. I figured to mention it but I didn't want to give too complex of an answer