The U.S. economic impact of marijuana could hit between $24 and $44 billion in the next four years, according to a new report by Marijuana Business Daily.

Economic impact includes not only sales of marijuana itself, but also any other dollars pumped into the economy in association with marijuana, from grow-lights to pipes, Yahoo reports. MBD assigned marijuana an economic multiplier of four, meaning for every dollar spent on weed, three more dollars are also added to the economy.

MBD’s prediction for the 2016 economic impact of marijuana was between $14 and $17 billion.

[MBD]

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