BILLINGS, Mont. — Gone are the flashing green neon lights advertising $200 ounces of pot. Gone are the caravans of cannabis doctors who signed up hundreds of people in a single day.

The medical marijuana business in Montana boomed after voters legalized it in 2004. At one time, this state of only a million people had almost 30,000 patients and 4,900 providers.

But the industry has been crippled by state legislators and a determined grass-roots opposition. And a state Supreme Court decision coming as early as October could all but wipe it out.

“It’s hard for patients to live like that, not knowing if they’ll have their cards next year,” said Elizabeth Pincolini, who runs a referral service in Billings that connects patients to the few doctors left willing to write marijuana recommendations. “It’s pretty desperate.” [Read more at NBCNews.com]