I also really don't think there is a big hazard in a deer gourging itself in salt. I have thrown out just plain salt blocks that we use for cattle and the deer seem to use them a bit but not eat them up like candy. A question i have is why don't deer get grain overload and bloat. I know with our cattle you have to be careful that they do not consume too much grain at a time otherwise they will bloat. Deer can feed on a grain pile in the field here all winter and handle it fine. Obviously the deer know when to stop, or maybe they have a better digestive system not quite sure what the deal is.