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Don’t bogart that megawatt, my friend.

A new study estimates that indoor pot-growing operations in the United States burn about $5 billion worth of electricity annually, or roughly 1 percent of national power consumption. That’s enough electricity to power two million average homes.

The electricity use of the typical grow operation approaches 200 watts per square foot, on par with the power usage of a modern computer data center, Evan Mills, a staff scientist at Lawrence Berkeley National Laboratory and author of the study, said in a statement. (The study was completed in his free time and without federal funds, Dr. Mills added.)

The study estimated that a single joint contains the equivalent of roughly two pounds of carbon dioxide emissions, the equivalent of running a 100-watt bulb for about 30 hours on the California grid.

Marijuana is considered the nation’s largest cash crop, with a production value estimated at about $40 billion annually. Legal restrictions have been steadily relaxed in recent years, with cultivation for medical purposes legal in 17 states.