Nanomaterials, the new big thing is a little thing

From cosmetics, to all kinds of new space age materials the new big thing is a little thing.  Nano materials are materials made so tiny, 1/10,000th the width of a hair,  they do amazing things.  Including being so small you can breath them in, right through even the militaries common masks for filtering harmful substances, they fly into the lung, right through it into the blood or organs where they might act like tiny grit cutting your parts up, or stick and give off their chemical makeup which is usually poison to us, or gather in some organ or body part they find cozy and let your body try to attack or entomb them, or maybe they just cause cancer or bizarre behavior.  I hate to be a ludite, but not every new thing should be put into use when industry has not shown a history of interest in safety for it's employees or customers.
For sure though, you'll never see it coming.