It may be worth mentioning that you can purchase skulls (medical research specimens on ebay.(see: http://shop.ebay.com/items/_W0QQ_fromZR46QQ_sopZ3?_nkw=skull+human&_sacat=0&_fromfsb=&_trksid=m270.l1313&_odkw=skull&_osacat=0) Skulls of this type often come with origin, sex and age, and generally are "stained" and "marked" in such a way as to identify them. I am guessing the this camera was built with one of these skulls - as from what I understand, they are the only ones that you can legally posses in the US anyway.

I really don't think you need to worry about zinc oxide unless you get your smoker roaring hot, for a couple of reasons - first off your smoker just isn't going to get hot enough, and if it did your food would be charcoal anyway. Zinc melts and starts to oxide at dangerous levels at 419.53 °C -or- 787.15 °F which is WAY hotter than you need to get your smoker to cook meat. Second - before you use your smoker you are going to want to season it - which means that are going to burn your smoker without any food in it for about 6 hours - this will give the smoker a film of tar that actually covers the interior of the smoker - this coating would burn off long before you would ever get any zinc oxide issues. Further, this coating of tar, is black, zinc oxide forms as a white crust on burned galvanized steel and as a noxious white smoke when it is being formed. the white would show up clearly against the black seasoning that will coat the smoker before you use it. I have a smoker rigged from a weber charcoal grill that I love, and have been using for over a year without any sign of zinc oxides forming, even in the areas closest to the charcoal. http://www.flickr.com/photos/riverrats/sets/72157594254309641/