Peanuts are not a true nut, they are a legume. Beside the allergen potential of the peanut itself from the natural lectins in all legumes, they can easily be contaminated with mold (aflatoxin) and all manner of nasty stuff. It might be just be in the one container you have, but true tree nuts like almonds are safer.
http://whole9life.com/2009/12/peanut-manifesto/
And all nuts are way too easy to overeat; not good if trying to lose weight.