At the stroke of midnight Wednesday, Canada became only the second country in the world to legalize recreational marijuana.

The end of marijuana prohibition is a watershed moment for Canada, but it comes with a lot of questions about how this will actually play out across the country. It also raises questions for Americans interested in partaking in the celebrations. Here are three things you need to know:

1. There are still rules

Canada is now the world’s largest legal weed marketplace, but this is not a pot free-for-all. You must follow local laws.

The new federal law sets a 30-gram — roughly 1 ounce — limit on how much marijuana people can buy or possess in public, but provincial or city governments may have other rules on where you can consume it. There is no current law on how much you can have at home, but there are limits on how much you can grow.

At present, the legal sale of pot is limited to fresh buds, oil, plants and seeds. Other products that are popular in some U.S. states — edibles, for instance — are not available for legal purchase yet across the border, though you can cook and consume them in someone’s home, according to Canada’s Global News.

2. Don’t bring weed back to the United States

You cannot bring weed legally purchased in Canada back into the United States. Though several border states have legalized marijuana (or allow the use of medical marijuana), the border between Canada and the United States is, as the Washington Post put it, “a thin marijuana militarized zone, where the drug will remain forbidden by federal law.”

Americans who buy legal weed and try to bring it back across the border risk arrest on possession or drug smuggling charges.

“I think we’re going to have a rough year-and-a-half learning curve as far as the cross-border issues,” said Rino Bortolin, a city councilor in the border city of Windsor, Ont.

3. How to roll a joint

If you’re still craving a trip north, Canada’s newspaper of record, the Globe and Mail, is here for you. The paper published a completely earnest infographic on how to roll a joint, titled “I just bought cannabis. What do I do with it?”

If you succeed at your task, the paper has got a city-by-city lineup of munchies, too.