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Washington is number one on the planet when it comes to cannabis consumption, and now there’s data to prove it, reports Leafly.

A new study from the University of Puget Sound and the University of Washington indicates that the Puget Sound area, including Seattle, has the highest level of marijuana consumption in the world, beating even Amsterdam in that regard.

“We are part of an international study … with 60 to 80 other cities around the world,” lead researcher Dr. Daniel A. Burgard said. “And according to wastewater, the Puget Sound area has the highest Cannabis use per capita, even over Amsterdam.”

Researchers conducted the study by analyzing sewage from a Western Washington city’s public wastewater from 2013 to 2016, looking for metabolites of THC. By measuring THC-COOH in thousands of samples of raw sewage, scientists aimed to track weed consumption levels and to try and determine if the legal I-502 market has displaced the black market.

Washington began legal retail sales in August 2014, so researchers were very interested in learning how legalization affected Cannabis use. Consumption did go up with legalization, according to the results, “suggesting a doubling” in THC consumption among residents between 2013 and 2016.

Image courtesy of Beth Noble | Leaf Nation