Their position on marijuana is hardly the only difference between Canada's prime minister and the president-elect of the United States.

But when Justin Trudeau's government introduces legislation to legalize cannabis this spring, it could spark problems between Canada and the U.S., particularly since Donald Trump has indicated he will keep pot illegal at the federal level.

Here's a look at what could change in Canada-U.S. relations once Canadians start lighting up legally.

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Laura Kane ~ The Canadian Press/CTVnews.ca via 420Intel.com ~