The organization campaigning to legalize marijuana in Ohio on Tuesday projected a legal pot industry in Ohio would generate $554 million a year in new tax revenues, mostly for struggling city and county governments.

ResponsibleOhio based its projection on 244.16 metric tons of marijuana being smoked, eaten, or otherwise consumed annually by 2020. That’s as many as half a billion marijuana joints a year, by one critic’s estimate.

“Ohioans already spend as much as a couple billion dollars each year on illegal marijuana, while our communities are simply not seeing the benefits,” ResponsibleOhio spokesman Lydia Bolander said. “That money could be in the hands of local governments and small businesses instead of drug dealers.”

ResponsibleOhio is hoping to put a proposed amendment on the Nov. 3 ballot that would allow adults 21 and older to use, possess, and share marijuana in Ohio. [Read more at the Toledo Blade]