When Prime Minister Justin Trudeau's government introduces legislation to legalize cannabis this spring, it could spark problems between Canada and the U-S.
Eight states have legalized recreational marijuana, but president-elect Donald Trump has indicated he wants to keep pot illegal at the federal level.
That means Canadians crossing the border could face trouble if U-S border guards continue a controversial practice of asking people whether they have ever smoked pot.
Immigration lawyer Len Saunders represents Canadians who have been banned from the U-S after making this admission, and he says he expects business to boom.
Scott Bardsley, a spokesman for Public Safety Minister Ralph Goodale, says the minister will continue discussions with American officials about treating Canadians appropriately at the border.
But at the same time, we could see border traffic increase in the other direction, from the U-S to Canada, according to an Ottawa-based immigration lawyer.
Betsy Kane says a legal recreational marijuana industry is likely to create a jobs boom, which will attract Americans with experience working in states where pot is legal.