ROBYN BECK/AFP/Getty Images Cannabis stocks continued to rally Monday.Tilray Inc. and Cronos Group Inc. shares catapulted to double-digit percentage gains Monday, as a recent surge from marijuana-related companies extended for another session. A report that Smirnoff- and Johnnie Walker-maker Diageo PLC DEO, +0.35% was in talks with at least three Canadian pot companies with the intent to purchase a stake or initiate a collaboration in one of them seemed to set off the buying frenzy Friday, and Monday’s trading saw Tilray Inc. TLRY, +2.86% gain more than 20% to $53.44, and Cronos Group Inc. CRON, +3.49% stock rose 21%. Aurora Cannabis ACB, +7.68% a Canada-based pot producer that doesn’t have a U.S. exchange listing, saw shares close 7.7% higher Monday. Tilray went public at $17 in July, and Cronos listed on the Nasdaq exchange earlier this year and has rallied more than 50% year to date. The benchmark S&P 500 index SPX, +0.77% has gained 8.4% this year. “This is like bitcoin BTCUSD, +2.87% levels, the kind of move Tilray is making,” said Jason Spatafora, a cannabis investor who runs Marijuanastocks.com. “The market is completely irrational. [Tilray’s] market capitalization is over $4.5 billion. That’s insane. They don’t have as much cash as Canopy or Aurora. It shouldn’t trade at half that valuation.”via