And what will PRC sell to Canada? Opium? Good try, but the Canucks already have pot! Home grown and likely the highest quality in the world in their homeland in Vancouver - BC Bud. Legalization is going to happen very soon, probably within the next year, by Spring 2017. China is a little late. Opium might appeal to some there, but I'd say most would rather stick to pot.
For competition, to see who is better, Canada is not interested to fight a war - they prefer to play ice-hockey. USA and Russia are their greatest rivals. China, still has a long way to go to be competitive in this sport.
Cheers!