Toxicity
Nerium oleander has historically been considered a poisonous plant based on a number of its compounds that may exhibit toxicity, especially to animals, when consumed in high amounts. Among these compounds are oleandrin and oleandrigenin, known as “cardiac glycosides” which are known to have a narrow therapeutic index and can be toxic when ingested.
seems we were taught not to use this for cooking hot dogs or marshmallows.
Good image here:
http://www.caf.wvu.edu/~forage/library/poisonous/images/oleander.jpg