I cannot satisfy hunger or thirst. I am not in your lungs or your blood. I am dismissed and derided. Called foolishness, delusion, and vanity. None of that changes my importance. Without me, you die. Simple as that.

I’m born when you remove me. I’m lost when you add me. I’m shared without leaving. I’m stolen without taking. Name me, and I vanish.

Without my first, I'm right behind The above word wouldn't be allowed by my first three letters here I'm plain and boring, I might be on your screen and you probably haven't noticed

Flakes fall Settled dust Gone with the wind Not of a season, but of a seasoned person

Choose this one, not that. Not pots, tops, or post. Stop's not where I'm at, and it's not spot, at most.