Phil Van Treese
With all the stuff out there about smoking and the various kinds of cancer, why would you want to destroy yourself slowly and risk cancer??? IF someone would walk into my dojo "High" or smelling of weed, leaving the dojo would be the fastest "trip" he'd ever have.
To quote George Carlin, "Have you ever noticed that their stuff is shit and your shit is stuff?"
But seriously, the most recent scientific studies on marijuana indicate that it may actually reduce the risk of cancer.
While best practice is to be fully lucid when you train, the most reckless and dangerous people I've ever encountered on the mat had both very negative attitudes about drug use and no regard whatsoever for their partners' bodies.
So I'm sticking with "case-by-case."