It remains to be seen which structure, active or passive, is most beneficial for investors considering marijuana ETFs. Excluding POTX simply because it's just a few days old, all of the marijuana ETFs that debuted this year along with the category's oldest member, ETFMG Alternative Harvest ETF (NYSEARCA:MJ), have been drubbed in 2019 as prices but not valuations have come down on a slew of previously beloved marijuana stocks.