KEY POINTS
  • "I'm worried that many of these companies aren't even worth speculating on" right now, CNBC Jim Cramer says. 
  • "Canopy will be the cannabis stock that the big institutions reach for," argues Cramer on the eve of Canada legalizing recreational pot use.

CNBC's Jim Cramer warned on the eve of Canada's legalization of marijuana for recreational use that he'd stay away from pot stocks for the time being.

"Everything related to the Canadian cannabis space has already run up dramatically and I'm worried that many of these companies aren't even worth speculating on," he said Tuesday evening on "Mad Money."