So far, 2019 has been disastrous for Aurora Cannabis ( ACB ). Year-to-date, its stock is down 30.46% on the TSE (Toronto Stock Exchange) and by 24.19% on the NYSE. ACB’s share price decline has even exceeded that of the ETFMG Alternative Harvest ETF ( MJ ). MJ has fallen by 21.25% so far in 2019. The Horizons Marijuana Life Sciences Index ETF ( HMMJ ) is down by 29.34%.