I fly within Canada a lot. I keep all my stuff in my carry on bag. I'd hate to put it in my checked bag and have the bag go missing.
The e-juice goes in the regular plastic bag they have at security and that's never been an issue. I keep my tanks and batteries in a little clear plastic tackle box. I pull that out of my bag at security and they usually ask what it is, I say "e-cigarette batteries and tanks" -- they nod and all is well.
But when I get through security, I put my e-juice (and any tank that has juice in it) into a heavy duty freezer bag, because stuff will leak! Folks have suggested squeezing the bottles until juice almost comes out, then capping them. I think opening a clearomizer on the way up and down would help too.
Hope you enjoy Toronto!