Every investor would love to watch one of their stock holdings expand from a relatively small position to a million-dollar-plus value. But gains like that don't happen often -- and they're even less likely to happen to you if you don't start by picking some companies for your portfolio that have significant growth potential.

One sector that's full of that type of potential? Cannabis. According to research company BDSA, the global legal cannabis market will be worth $55.9 billion by 2026. To reach that size between now and then, it will have to grow at a compound annual rate of more than 17%.

Tilray(NASDAQ:TLRY) could benefit from a lot of that growth. It's already one of the top cannabis companies in the world, and once its merger with Aphria (NASDAQ:APHA) is completed later this year, it will become even bigger. But could investing in Tilray make you a millionaire?

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