Canada is running low on legal pot three weeks after the government approved the use of recreational marijuana, a shortage that is sending some frustrated consumers back to the black market, writes Dan Bilefsky.

At least three provinces — Ontario, Quebec and New Brunswick — are facing a dearth of legal marijuana and two of them have seen outlets selling cannabis temporarily shut down for lack of supply.

U.S. Customs and Border protection says border officers in Montana are intercepting travelers from Canada who are in possession of marijuana.

Two Americans were also recently arrested after admitting to having a marijuana pipe and biying marijuana in Canada. Hash oil and other declared items were also in their vehicle.

Border officials say although recreational marijuana may be legal in Canada and some U.S. states, it is reminding travelers that pot remains illegal in most of the U.S.

It says Canadians working in the marijuana industry coming to the U.S. for reasons unrelated to the marijuana industry will generally be allowed entry.

https://www.benzinga.com/markets/cannabis/18/11/12585853/what-legal-cannabis-means-for-canadas-economy

Canada is buzzing after the legalization of recreational cannabis, with long lines at the few retailers already open, a supply shortage, impaired driving fears, people taking to the streets in joy ... 

But what does legalization mean for the Canadian economy? How much is the market potentially worth?

The legalization of cannabis on October 17 was a huge day for Canada, but for drivers it has created a lot of questions. Like alcohol, cannabis is considered a substance that impairs your ability to drive, but what constitutes ‘impairment’ is somewhat unclear right now, and impairment rules differ between police forces across Canada.

Mexico’s Supreme Court on Wednesday ruled for the fifth time that the country’s prohibition on marijuana is unconstitutional, essentially making it difficult for authorities to successfully prosecute someone for consumption, possession or cultivation of the plant.

Ontario still has problems shipping pot

Canada officially legalized marijuana on October 17, but Canadians across the country have had a tough time getting their hands on the product — legally, that is.

Patrick and Michael, 26, roommates in downtown Toronto, have had a somewhat typical post-legalization experience. (Their last names withheld because they purchased marijuana illegally.)

Less than two weeks after weed was legalized in Canada, it's already been reported that Canadians have been denied from entering the United States because of admitted cannabis use. Canadians that have smoked weed previously have been worried about getting banned from the United States after legalization. 

Roy Ludwig, the mayor of Estevan, Saskatchewan is speaking up after he says that multiple Canadian residents have been turned away from the U.S. border on the premise of previous pot use. The Canadian town is situated close to the border crossing of North Dakota, where marijuana use is still illegal.

Last week Canada became only the second country in the world to legalize recreational marijuana, but the black market for pot is continuing to thrive as customers seek out products that they can’t buy legally, including edibles, and sellers push back on government intervention in their industry. 

The legalization of recreational cannabis in Canada has been fraught with difficulties. 

First, the supply of legal cannabis is quickly evaporating. In Quebec, the société québécoise du cannabis (SQDC), the government-run agency with a monopoly on marijuana sales, has had to close its doors three days per week to manage its already-limited stock.

There has also been some confusion among law enforcement agencies about the particulars of the new cannabis laws. Though, that hasn't stopped some departments from issuing hefty fines for some weed-related offenses.

Then, of course, there's the issue of American officials, who vehemently oppose the legalization of recreational marijuana.