Lina the Dragon Spooker@renkotsuban Canadian here (born and raised in British Columbia, spent most of my life there, now living in Alberta. I say "Eh" all the time (most often if I haven't heard something/need clarification, "Eh?", but also things like the stereotypical "How's it goin', eh?", or in answer to that question ("Eh, you know how it is.")
As you're probably seeing from other comments, even in Canada there's debate about (which I don't pronounce as "aboot" :P) who actually uses it, but I'll say that I know people from all over the country who use it, from various walks of life, with little or no background in common. It's just one of things things.
I'm not even sure I know how/when I started saying it, and likely it was by being exposed to Bob and Doug McKenzie a lot as a kid, but also just media in general.
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