In Halifax, the survey found 748 milligrams of THC metabolites per 1,000 people per day – well above the 448 milligrams average among the surveyed cities
Waste water tested in Halifax in 2023 contained almost twice the amount of cannabis metabolites compared with samples taken from other big cities in Canada , like Toronto or Montreal.
Lisa Oliver, chief of the survey, said researchers continuously collected samples from waste water plants over a one-week period and calculated the concentration of drug derivatives found in them. While there’s no way to know for sure why Halifax’s rate of cannabis use is so much higher than other major cities, psychiatrist and Dalhousie University professor Dr. Phil Tibbo says the province’s Department of Health may want to consider the survey results when, or if, it looks at revising its cannabis policies.
Tibbo said that while the hypothesis is only anecdotal, he believes the high rate may be due to the fact a “cultural acceptance has been there for quite some time” in Nova Scotia’s capital regarding marijuana. “And more recently, a lot more attention is being paid to the potency of cannabis products,” as a high risk factor for psychosis, Tibbo said, adding that for many years cannabis plants only produced flowers with between one to two per cent THC.
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