According to this article over on Listverse, the plant is not poisonous to have around at all. That's probably a good thing since so many folks use them for decorating this time of the year. Here is the article for your enjoyment.
The Poinsettia Is Incredibly Dangerous
The poinsettia is almost as common a Christmas decoration as a tree in the family room. If you have pets or small children, you’ve likely heard that they’re at risk just by having the plant in the house. The poinsettia is highly toxic and extremely poisonous, according to common belief. Any curious explorers can end up in the emergency room after ingesting the plant.
That’s not true. The poinsettia has only a mild toxicity to pets, and ingesting the white sap of the plant won’t be deadly or poisonous. It might result in a little drooling, some discomfort around the mouth, or (in extreme cases) vomiting and diarrhea—but it’s not deadly.
The rumor goes back to a single unproven story from 1919. According to the urban legend, a two-year-old child of an Army officer died after eating a leaf from the poinsettia. The story has never been established as real, and organizations like the US Consumer Product Safety Commission have found no reason for the plants to even carry warning labels. Yet the myth has persisted.
It also overshadows another Christmas plant that can be more dangerous—mistletoe. Both American and European mistletoe can cause anything from mild poisoning symptoms (vomiting and abdominal pain) to low blood pressure, cardiac issues, and collapse. Pet deaths from eating mistletoe have also been confirmed.
Ya know, even though the poinsettia is not poisonous, I wouldn't eat any, if I were you. Better safe than sorry, I say. You might want to pass on the mistletoe salad while you're at it. Just hang it up and avoid nibbling on it, OK?
Coffee in the kitchen this morning. Ya'll can help bake some cookies, alright?