But I will note that it isn't harmful for electronics, but it can be harmful for humans. The nitrogen displaces oxygen in your lungs and you can very easily suffocate if you try to huff it.
Edit- I say this because it recently came up in preclass conversation before one of the courses I lecture.
[Edited by Dhampy, 2/11/2014 5:30:08 PM]
One of my old acquaintances from high school got hooked on "huffing duster"... she was attractive and rather intelligent... now as I understand it, she is essentially a walking vegetable.