Hi Gray Beard,
I was perusing the blogs this evening hoping to find some information about possible allergic reaction in our hobby. Much to my surprise it appears to be fairly common with CA. In your post you state that it gives you a cold.
I have been suffering over the last few months from cold like symptoms just about every time I start up building. My symptoms are mostly a stuffy nose. just like a cold and it lasts for approximately 2-3 days. For a while I did not make the connection but am glad to know that CA does cause a bad reaction with some people and that I am not just a sickey.
I like working with CA as it is fast and efficient. I wonder if some sort of mask or ventilator would work? I did use a cheap carpenter's mask the other night and it did not work. ( I have the cold like symptoms to prove it)
Yours or anyone else's thoughts would be appreciated.

Thanks