The agency is preparing to track weed's effect on economy and society when it is made legal next year.
The report found use of pot has increased over the years as it became more popular with adults.
In the 1960s and 1970s, the market was predominantly driven by young people.
However, by 2015, 6 per cent of 15-17-year-olds consumed cannabis, while two-thirds of users were over 25.
Canadians consumed around 697.5 tonnes of the drug in 2015, the report said, putting the estimated value of consumption between $5.0bn (£2.9bn) and $6.2bn (£3.5bn).
The researchers arrived at those figures after estimating the drugs market value to be between $7.14 (£4.14) to $8.84 (£5.13) per gram.
Justin Trudeau, the Canadian Prime Minister, has committed to legalising the recreational use of cannabis by July 2018.
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