Cannabis stocks fell sharply Monday, swept up in the broader market rout that was triggered by an oil price war between Saudi Arabia and Russia and the continued spread of the coronavirus. The ETMG Alternative Harvest ETF /zigman2/quotes/204332491/composite MJ +1.52% was down 5.7%, with every one of its constituent stocks, which include tobacco companies, trading lower. The Cannabis ETF /zigman2/quotes/213173823/composite THCX +1.30% was down 7.5%, with all of its constituent stocks lower. Aurora Cannabis Inc. /zigman2/quotes/210559470/composite ACB -1.58% /zigman2/quotes/203734337/delayed CA:ACB -1.69% , the most widely held stock on the trading platform RobinHood, fell 9%. Canopy Growth Corp. /zigman2/quotes/200603886/composite CGC +2.66% /zigman2/quotes/202205609/delayed CA:WEED +2.66% , the market leader, was down 5.6%. Tilray /zigman2/quotes/209129655/composite TLRY +0.60% was down 10%, after MKM analyst Bill Kirk said he's struggling to make sense of the math in Tilray's guidance that it will have positive adjusted EBITDA in the fourth quarter of 2020. "Adjusted EBITDA would still be negative even if: 1) 4Q'20 revenue was 2x 4Q'19 (difficult, but possible); 2) gross margin expanded 500bps (low probability that needs large international contribution); and 3) adjusted SG&A costs were flat y/y on an absolute basis (extremely unlikely given growth required)," Kirk wrote in a note to clients. Kirk lowered his fair value estimate on the stock to $13 from $26. Cronos Corp. /zigman2/quotes/206842762/composite CRON +0.47% was down 3.4%. The S&P 500 /zigman2/quotes/210599714/realtime SPX +1.36% was down 4.8% and the Dow Jones Industrial Average /zigman2/quotes/210598065/realtime DJIA +2.05% was down 5%.