Grinding HSS tool steel and cemented carbide products produces a fine dust that is potential hazardous. As hobbyists we think we are not exposed to the dust for any extended periods of time, and never read the warnings. Should theses words be read? HEALTH HAZARD DATA Inhalation: Dust from grinding may cause irritation of the nose and throat. It also has the potential for causing transient or permanent respiratory disease, including occupational asthma or interstitial fibrosis, in a small percentage of exposed individuals. It is reported that cobalt dust is the probably cause of such respiratory disease. Symptoms include productive cough, wheezing, shortness of breath, chest tightness and weight loss. Interstitial fibrosis (lung scaring) can lead to permanent disability or death. Certain pulmonary conditions may be aggravated by exposure. Information is our best tool for avoiding health risks. Let's face it, many of us are at the age where we don't need an added health hazard. A dust mask or even a fan blowing the dust away from us can remove this one easily.