silver it self is a heavy metal. so due to the history of heavy metals (lead, tin, barium, molybdenum, on and on and on)
naturely one would want to avoid such a material.

Silver, niobium, titanium, and some other heavy metals have almost no interaction in the human body. It mostly passes through via the digestive track.

the condition you speak of is caused when you over load your system's way of getting rid of heavy metals.
eccesive silver is stored in you fat cells, giving you a grey complection.
you can take CS by the directions on the bottle and not contract
so if you do smoke your bud that has been dowsed in silver
and drink CS by the gallon everyday,you will most likly turn grey.
you'd turn grey from that amount of CS anyway
Do some research