Ham for cats?

I personally do not see why ham is poisonous to cats. However you need to know that many processed meat are not very healthy due to the amount of salt in there. It is not even recommended for humans to extensively eat processed meat. Occasionally having a piece of ham will bring no harm to a human or a cat.

I agree with Fishbone's suggestion, rotate different treats if you can. It is more healthy for anyone to have a more variety of food.