It verifies the buyer's age with a special ID scanner.

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Pot stores, pot vending machines, and…

"Yes, there are pot stocks. Nearly all of them are thinly traded penny stocks available only on over-the-counter exchanges, but shares of companies that service the growing cannabis market have been blazing in recent weeks." (Source: Money.CNN, January 2014)

Last November, Forbes.com listed the "8 hottest publicly traded marijuana companies."

And ViridianCR.com has an entire website for tracking cannabis-related businesses.