Part of what makes asbestos (and also fiberglass) dangerous, isn't just the sharpness but also the long shape which means that macrophages can't engulf them. M

Part of what makes asbestos (and also fiberglass) dangerous, isn't just the sharpness but also the long shape which means that macrophages can't engulf them. Moon dust is still problematic since although smaller it also can't be digested by macrophages and it's believed it would accumulate in the lungs, building up on repeated exposure.