People in the United States spend an estimated $18 Billion a year illegally buying marijuana on the black market.
The legal medical marijuana market is valued at $1.5 Billion a year in 2013. Industry analysts estimate that the medical market industry could be worth $6 Billion by 2018.
The worldwide market in illegal marijuana is currently valued at $141.80 Billion.
Source: Tim Mullaney, “As marijuana goes legit, investors rush in,” USA Today, April 8, 2013.