The number of first-time cannabis users in Canada has almost doubled since the drug was legalised in October.
A national survey by Statistics Canada found 646,000 people had tried the drug for the first time between January and March this year, compared to 327,000 in the same period last year.
Mary Brett, of campaign group Cannabis Skunk Sense, said the results were “utterly predictable” and described the move as going down “a very dangerous path”.