I'm not 100% sure, but make sure you keep asking around. You can try calling Customs Canada or their website (I'm sure they have one)...also, ask the people you are buying from (they might or might not know)....if they're not sure, don't take any chances !! I've heard horror stories of how (for example) UPS doesn't mention that their "package" has to be picked up at the border, and then more fees $$ on top of all the taxes as well. Be carefull....you don't want to drive from Northern Ontario and then find out you're going to pay $100.00 for a 50g tin of pipe tobacco !!
For me,....it would be better to drive to Buffalo,NY for cheaper tobacco....but, if I'm driving accross the border, I might as well keep driving to North Carolina and make a tour of it !!!
It would be nice to see some of the famous tobacco producers and smoke shop outfits !!
Remember.....don't assume anything (especially when it comes to Canada Customs !)...find out ALL THE DETAILS (and when you do....let me know too).
Good Luck.