Unfortunately, there is no good research yet [1]. As you say, it is quite possible that there is essential zero effect.
There are some indicators that concentrated nanoplastics (smaller particles) are harmful. [2]
[1] https://www.upi.com/Health_News/2019/08/22/WHO-More-data-nee...
[2] https://www.sciencedaily.com/releases/2017/09/170925104730.h...
Unfortunately, there is no good research yet [1]. As you say, it is quite possible that there is essential zero effect.
There are some indicators that concentrated nanoplastics (smaller particles) are harmful. [2]
[1] https://www.upi.com/Health_News/2019/08/22/WHO-More-data-nee...
[2] https://www.sciencedaily.com/releases/2017/09/170925104730.h...