I would expect banana peels to be quite toxic on average. Lots of pesticides, and unless you live in a place where bananas grow, who knows what they do to the bananas to prepare them for shipping.
Wouldn't organic bananas avoid that?
I wouldn't count on it, as there are varying definitions of organic.
A few pesticides are quite toxic to humans. Most aren't. There are some (e.g. cypermethrin) with no known lethal dose in humans.