Quote Dan B:
I'm not keen for me and my studio users to be incarcinogating (to coin a word) themselves...
The fact that you suffer from asthma is one thing, the dust from this (along with a world full of other things) can cause you to have an attack. That's a valid concern.
That being said, fiberglass is not a carcinogen, studies have taken it off even the "possible carcinogen" list.
It would be best if you weren't one of the people helping to spread false information on the internet.