A recent study published in the journal _Environmental Science & Technology Letters_ on December 18 revealed that many popular smartwatch bands contain high concentrations of perfluorohexanoic acid (PFHxA), a synthetic chemical that is notoriously difficult to degrade and has been linked to a range of health problems, including cancer, high blood pressure, and infertility. The reliable Chinese tech news portal, ITHome, reports that this chemical crisis is hiding in plain sight, imperiling the health of millions of users worldwide. (Source: [ITHome](https://www.ithome.com/0/820/764.htm); [ACS](https://pubs.acs.org/doi/abs/10.1021/acs.estlett.4c00907))