A long-dormant trade is suddenly showing signs of life. Prices are climbing. Volumes are spiking. And in a corner of the market that’s spent years in the doldrums, one ETF is catching a fresh buzz — thanks in part to the US Justice Department’s move in April to reclassify medical marijuana as a less dangerous drug.

On this episode of Trillions, Eric Balchunas and Joel Weber debut a new monthly segment spotlighting an ETF that’s having a moment. This time, Bloomberg Intelligence’s Andre Yapp joins to break down the AdvisorShares Pure US Cannabis ETF (MSOS). The only cannabis-focused ETF with more than $1 billion in assets, it uses swaps to access marijuana companies just as shifting tax rules begin to ease the industry’s burden. The setup looks promising—but is this a real turning point, or just another short-lived high?