The article goes on to say

Marijuana stocks have soared as state after state in the U.S. has legalized marijuana for medical or recreational use. The market potential is huge, with some estimating that the marijuana industry in the U.S. could generate sales of more than $18 billion by 2020.

 

Read the full article https://www.fool.com/investing/2017/06/30/forget-the-us-marijuana-market-there-are-big-oppor.aspx