Few industries in the U.S. are growing at a quicker pace than legal marijuana. According to a fairly recent report from Marijuana Business Daily, entitled “Marijuana Business Factbook 2017,” legal pot sales in the U.S. are expected to rise by about 30% in 2017 to a range of $5.1 billion to $6.1 billion, with the total U.S. market expected to expand to around $17 billion by 2021.