The global legal marijuana market may be worth $66.3 billion by the end of 2025, according to the Grand View Research. The cannabidiol (CBD) market in the U.S. alone may be worth $16 billion by the same year, according to an analysis published in February by Cowen & Company. But the market has already become crowded with competitors and some experts believe that the price of cannabis is likely to drop drastically in the future.