I assume it's orders of magnitude better than asbestos obviously, since flour is organic and decomposes, but it still doesn't seem great. If the particulate is this small, it can probably get pretty deep into your lungs and just sit there for a while. I'm no expert, but I don't know what would decompose flour in your lungs, especially if it's going to get deeper being so light and tiny.

Like it's not asbestos, but it's also not air. So maybe nanopasta comes with an MSDS binder.

This.

Asbestos is like having glass shards that are so sharp they keep damaging cells and never go away. Constant cellular repair statistically results in cancer.