An estimated 1.3 million Japanese aged 15 to 64 have used marijuana, surpassing those abusers of paint thinner and other inhalants for the first time, a survey by The National Center of Neurology and Psychiatry shows.

The center, based in the western Tokyo suburb of Kodaira, began the biennial substance abuse survey in 1995. The latest survey was conducted on 5,000 people in the stated age bracket between September and October 2017, and drew 2,899 respondents, the results showed Sunday.

The center's estimated figure of 1,331,765 habitual and nonhabitual marijuana users, an increase of around 380,000 from the previous survey, was calculated using population ratios and other factors.