Did they stop using mercury? Because that stuff definitely produced fumes, and a small droplet of that, however tiny, is enough to worry about. Dentists have this problem all the time.
OK, I'll be extra careful when opening/closing the tube so as not to get in contact with it.
IIRC, Artic Silver 5 uses, um, silver
. Actually finely ground silver so as to fill in the micro-gaps between the IHS & cooler.
I'd think that if some consumer product contained mercury, they would have to put a warning label on it.