This is something that all turners should be aware of and do a little research on and material that you plan to turn.
Turning produces fine dust. The dust from most materials will only cause irritation to the eyes, nose and mouth. Others such as Walnut can produce a mild laxative effect. And some exotic woods like Hemlock are Toxic and linked to nasal cancer.
Point being you should always know about the Material before you start to work on it.