[Cocktail]

As to why there has been only papers stating potential harm, I believe that is due to the long term study cycle. When can a researcher positively conclude confirmed harm? In humans, that could take a lifetime, maybe two. Other animals must also be studied, but doing that can be much more difficult and resource intensive. Here thinking about marine life primarily. Point being, everything thus far learned points to harm in the long term. Long term studies have only begun in the last 10-20years I believe, and could be that we will be waiting for further still