Safety Question

Is there a lubricant used in air cylinders that is potentially harmful if you happen to get a whiff of it when you de-gas and open the cylinder?

Opened a cylinder this evening on a Brocock Grand Prix and something in that cylinder has made me short winded, I think.

I should add that I am not sure the issue was caused by what I smelled coming from that cylinder. I have never had that gun apart until today but the previous owner probably did so ... anyway, thoughts?

Thanks in advance.