The cannabis sector traded mostly lower Tuesday, with the ETFMG Alternative Harvest ETF MJ, -1.34% down 1.0% as 24 of 38 components traded lower. The Horizons Marijuana Life Sciences Index ETF HMMJ, -1.64% dropped 1.4%, with 43 of 57 components falling. The declines come the ETFMG ETF gained 4.6% and the Horizons ETF advanced 5.5% over the past two sessions, while the S&P 500 SPX, -0.17% tacked on 1.5%. Among some of the more-active pot stocks, Aurora Cannabis Inc. ACB, -2.64% ACB, -2.47% fell 2.6%, Canopy Growth Corp. CGC, -1.75% WEED, -1.86% shed 2.1%, Cronos Group Inc. CRON, -2.42% CRON, -2.04% gave up 2.5%, Tilray Inc. TLRY, -5.15% slumped 5.3% and Canopy Rivers Inc. CNPOF, -1.42% RIV, -2.11% lost 1.4%. The ETFMG ETF has now lost 10.3% over the past three months, while the S&P 500 SPX, -0.17% has gained 3.7%.