Yep, laser toner is literally plastic dust that gets rolled on then baked. That’s why it doesn’t smudge or rub off when wet - it’s plastic.

That’s why there’s so many large warnings to properly recycle toner cartridges.

Tbf as long as the toner doesn’t spill anywhere, the risk is lower than other background sources like tyre dust. Still gives me the hereby jeebies though.

How printer dust is polluting the air? – TCTEC® Innovation - tctecinnovation.com/…/how-printer-dust-is-polluti…