Malkin, as far as I know it really isn't healthy to eat raw potatoes. I'm not so sure if it is severely poisonous, but you shouldn't use uncooked potatoes because they contain a substance that you get rid of by cooking them. I don't know if this is true for sweet potatoes as well.

Hmmm you make me crave sweet potatoes. They are not very common here, so I don't get to eat them very often, but I like that sweet flavor very much.