What can it do you ask? The fiberglass dust is essentially little knives that once in the Bronchi of your lungs will remain there and cut the interior lining. Advance cases over time can and have caused emphysema, bronchitis and cancer. Not too mention other upper respiratory diseases.
latest statistics say that becoming a career firefighter will on avg reduce your life expectancy by 10-15yrs due to the exposure of particulates and gases from their job over a 30yr span.
Breathing the dust and fiberglass from making bows on a reg bases for the same period of time will most likely result in death through suffocation/congestive heart failure.
Dont think that sawdust or more importantly fine air particles are benign either. they are Desensitizers. That means every time you come into contact with them through ingestion, inhalation or contact too bare skin, your body becomes more sensitive too them. This can manifest in the form or itching, a rash, hives, etc.
Not ment to scare anyone but is ment to make ppl aware.
shane