Until recently, the marijuana business was solely a black market, fueled by drug traffickers and gangs.

However, as more and more states move to legalize or decriminalize marijuana, several legitimate business enterprises have sprung up with the goal of profiting off of the drug.

To find out more about the growing legal marijuana industry, we spoke to Justin Hatfield, the entrepreneur behind WeedMaps.com, a juggernaut site that pulls 50,000 unique visitors per day and generates $1.5 million in listing fees alone each month, according to documents put out by the company.