The cannabis industry is growing and, naturally, investors are taking notice. With 30 states and the District of Columbia having legalized the use of the drug for medicinal or recreational use, the stock prices of the companies that grow, process and sell marijuana have been rising. Late last year, the first marijuana-focused exchange-traded fund, or E.T.F., listed in the United States began trading, making it easier for investors to buy into a swath of companies connected to the industry. As Marijuana Goes Mainstream, Investors Rush In

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