Tamara, A very interesting article and as you said, an unusual and lovely flower. Anytime you mention blue, hummingbirds, and butterflies in one article you've got my attention. I've never heard of salvia as an illicit drug, although I guess I shouldn't be surprised. As far as the flowers/leaves as an incense, DH and I throw bergarten sage and common sage leaves on the spent charcoal to chase away the misquitos at sundown. I don't know that it actually works, but it does make a lovely incense.
It's Salvia divinorum that is used as a drug (and I believe it was used long ago by the Aztecs or Maya so it's not really a new thing, but it's been getting more attention in the news lately) I don't think there are too many people growing that one as an ornamental so us gardeners don't have too much to worry about!
From what I understand, Salvia divinorum is not easy to grow. I think it's tropical. Some states are making it an illegal substance. Mostly because of teenagers abusing it. Next, they'll probably go after the beautiful daturas.