KEY POINTS
  • CNBC's Jim Cramer doubles down on his warning about investing in marijuana stocks like Tilray.
  • Shares of Tilray, a Canadian medical marijuana play, have been trading wildly since CEO Brendan Kennedy's appearance on "Mad Money."

As shares of Canadian cannabis producer Tilray continued their wild bout of trading on Thursday, CNBC's doubled down on his declaration that investors are getting carried away with their enthusiasm around pot stocks.

"This whole group has gotten too hot — no argument here," he said. "Is it a bubble? Absolutely."