Digital BW, The Print

Just curious- any of you other smokers (I know you're out there!)
noticed yellowing prints?  I left a scrap print made on EEM laying on
top of my scanner and noticed that after a day or so it had become
noticebly yellow. In fact all the scrap prints I have laying around
are discolored, none of which have never come into contact with
newsprint (hell, i don't even get the paper, just find the news too
depressing these days). I smoke alot when I work, so obviously I
theorize the coating absorbed the residue from the cigarette smoke. 
Anyone else?

And I already know that I will die a painful death of lung cancer so
no lectures please;)
john