In case you hadnt noticed, the most popular free game on iTunes right now lets you grow and sell virtual marijuana. And its pretty fantastic. “Weed Firm,” which hit the App Store earlier this month, is probably the closest you can get to being a drug dealer without actually breaking the law. As CNET notes, it’s surprising to see this game available via Apples app platform, considering the companys typically strict moral criteria for approving new apps. (Story continues below.) A screenshot of a customer interaction in Weed Firm. …