Praise then darkness, and creation unfinished

Because it can't hurt to ask:

I'm flying from Seattle to Montreal next week, via Vancouver (YVR). I have about a two-hour connection, and am wondering what my chances are having time to buy lunch on the ground. The Vancouver airport website seems to say that I may have to go through airport security again (having already done it in Seattle), as well as Canadian customs and immigration, which seems a bit odd and potentially time-consuming. It's also not clear, if I check a bag in Seattle, how far I will have to schlep it in Vancouver before giving it back to Air Canada to transport the rest of the way.

I'm not too worried, because it sounds as though Air Canada will be happy to sell me a sandwich and serve me something caffeinated, so I won't starve or get extra-grumpy, but while airport fast food isn't great, it's probably better than what I'd be able to buy on board. (Going through customs and immigration is a constraint on the "just bring lunch from home" approach, though it will do no harm to see if they'll let me bring some pecans or cashews into the country.)