Kristin Davis opines that there is one fact that Americans, and New Yorkers, must face (as it slaps us in the face): Prohibition hasn’t stopped the use and domestic production of marijuana. Marijuana is currently used by over 25 million Americans annually and cannabis is the largest cash crop in the United States. In fact, the only thing prohibition has done for the people of New York is cost them a huge amount of money — somewhere in the ballpark of $10-15 billion a year.