** Cannabis firms rise premarket after the U.S. Acting Attorney General Todd Blanche said on Thursday the Department of Justice was reclassifying FDA-approved and state-licensed marijuana as a less-dangerous drug
** Tilray TLRY.TO up 10%, Aurora Cannabis ACB.TO rise 6%
** ETF AdvisorShares Pure US Cannabis MSOS.P gains 11.35%
** The decision to reclassify marijuana represents one of the most significant federal changes to marijuana policy in decades, removing barriers to researching the drug's potential use cases
(Reporting by Sriparna Roy in Bengaluru)
((Sriparna.Roy@thomsonreuters.com;))