eayob, I believe that if they sent it with a courier rather than postal service, you would be guaranteed to have to pay customs duty.

I’ve been pretty lucky (I’m in Alberta), only one order (my first, with a “Bullet” in a bag included) got hit with duty, but my last few orders of the same size have made it through no problem and quite quickly.

Seems to be random enforcement though, I used to order snus and it was fine at first but later it seemed every order was dinged with duty.  Almost makes me think that a customs agent had flagged my address for orders coming from Sweden, but that might just be a bit of paranoia.