THC % By Decade - Quantity of THC in weed (seizure data)
Age at first use
The median age of starting cannabis use was 17 years old for both males and females in 2015 survey.
Canadian Cannabis Use Statistics
In 2015, the prevalence of past-year cannabis use was 12% for all age groups
Youth 15-19 = 21%
Young adults aged 20 to 24 = 30%
Adults aged 25 or older = 10%