I'm pretty outspoken on tumblr on the subject.
I am very careful to avoid it, and rather meet in dialog with indigenous and closed cultures, as well as sticking to those that I can claim.
As a Scottish-Irish Romany Finn mix, I have a host of places to draw from, as a hedgewitch and animist.
I see too often, white people (they tend noble savage ideas of the natives, and lots of them wear dreads) predominantly, try to use the term Shaman for themselves, when they kind of blatantly rip of and bastardize indigenous practices, and won't choose the European shamanic practices because they are not "exotic" enough, for their tastes.
When presented, I ask this "So you serve your community as an intermediary between the people of your community and the unseen?"
Typically, they stutter.
As for smudging, I don't use sage, largely due to the problems in harvesting (sage is endangered), but also because smudging is a very specific number religious of practices in indigenous american cultures. We have our own equivalent, with our own mixes of herbs, the Recaning of Britain, or simple smoke cleansing as it should be called.