Well-fitting goggles are important. If they slip in a bad situation and you can't see anything, that can get ugly.
There are loads of stores where you can try on countless goggles in Vancouver. Got to W4th & Burrard in Kits where you have five good stores on one block (Pacific Boarder, Boardroom (plus outlet), Showcase and West Coast Sports). Find a pair that fits and sell your Smiths on craigslist.