Causing at most only minor discomfort, American Mistletoe does not seem to have earned its reputation as the "kiss of death." Its European cousin, Viscum album, sometimes used in herbal remedies, is more toxic, but is not sold commercially in North America and is thus rarely encountered.
Native plants such as American mistletoe and bittersweet American shouldn't be used as Christmas decoration, not because of intoxicant, but because they are becoming so rare in the wild.
My parents have an American bittersweet. My mother's cousin would come out every year and harvest it until it disappeared.
The bittersweet didn't return until 8-10 years after she passed away.