Rest assured there are and it can be extremely severe. I used to grind all the time commercially. I started having some severe health issues, and later it was found that turkey feather dust gives off naphthalene, the same chemical that is in moth balls. It took the Dr's, and several MRI'S to finally find that the dust and chemical had gotten into my blood, and had gone to the capillaries and clogged them in my brain on my left side. Completely blocked and causing some severe issues. Not only did I have to stop, and sold my business to Matt G on here, but it left me with some issues that will never be able to be corrected because it has no way out of my system.
If you think for one minute that this does not harm you, I will send you all my medical bills and you can pay them. DO NOT GRIND WITHOUT PROPER VENTILATION AND RESPERATIORS. PERIOD.
I am also the one with the extreme case of the sarcoidosis and having the battle of and for my life right now. Although the sarcoidosis was found before I was grinding on a large scale, I am sure the feather dust had a lot to promote it. I am on a chemo drug right now as we speak for the sarcoidosis and it is not fun, and not guarantee that the meds are going to put it back into remission.
And as of yesterday, it was found that the drug is not doing what they thought it would do, so I will only get that, by my choice, only two more weeks, and then it is all in God's hands as to what happens.
So grind away, and I promise you, it will shorten you life.