![How illegal dispensaries are a threat to the legal cannabis industry thumbnail](https://i.ytimg.com/vi/rJEP4AsQqBM/hqdefault.jpg)
The booming business of cannabis is what many investors are calling the new gold rush. But with those potential riches comes this reality: there’s a much bigger boom in the black market of weed that’s crippling legal sales. CNBC’s investigates what’s really going on inside the unlicensed dispensaries which play by their own rules.