A lot of people will be working at those companies and it's a very safe bet that tens of thousands Canadians have smoked pot.
Anyone subject to a lifetime ban from entering the United States can apply for a waiver, though that costs more than $500.
In a piece titled, "U.S. Border Policy on Pot Is About to Get Even Stupider", Splinter's Sophie Weiner points out that upcoming "midterms could change all of this".
The rub is that it's illegal to have smoked the drug in Canada before October 17, and it's illegal to lie to any border agent who asks about it.
CBP has not specified a minimum investment threshold in marijuana businesses that would trigger the lifetime ban. US border officials have warned Canadians who smoke marijuana, work in the cannabis sector - or even invest in burgeoning pot companies could be barred entering the country. Until his comments, the BI Canada Cannabis Competitive Peers index had gained almost 50 percent since the Canopy-Constellation deal was announced.
But Prime Minister Justin Trudeau said Tuesday that he does not think he has the right to press the US on its admission policy.
So what to do when you want to cross the border?
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They say that despite one in eight Canadians using cannabis today, 400,000 people move between our two countries every day nearly entirely without incident.
Despite that Canada will have legal cannabis nationwide in a month, and that a majority of states have legalized cannabis to some extent, the plant remains illegal at the federal level. That message hasn't "fully sunk in" yet, especially with more casual tourists, said Continental Travel Group President Daryl Silver.
Cars from Canada line up to cross into the U.S.at Blaine, Wash.
Canadians spent $19.8 billion on tourism south of the border in 2016, according to the International Trade Administration.
"People are careless and I think people will be caught by accident and this will create problems", said Lorne Waldman, an immigration lawyer.
"We don't recognize that as a legal business", Todd Owen, executive assistant commissioner for the Office of Field Operations at CBP, told POLITICO Pro Canada, a new subscription news service and daily newsletter focused on Canada-U.S. relations.
"There's absolutely no way you can say if you've invested in the is industry you're not going to be allowed into the United States", he said.
"You're not just going to see these northern Washington cases, you're going to see them Canada-wide from east to west coast", he said.