It is one of the most controversial topics in BJJ today. High level practitioners have come down on both sides of the issue, resulting in highly publicized verbal clashes. Is smoking marijuana a boon or a liability for jiu jitsu practitioners?
Eddie Bravo is one of the highest profile advocates for marijuana use in jiu jitsu. According to him, it elevates the practitioner’s consciousness, opens their mind to new ideas, and consequently improves their ability in the sport. Joe Rogan (UFC commentator and a brown belt under Eddie Bravo) is another outspoken advocate of marijuana use.
Perhaps the most vocal critic of marijuana use in BJJ is Rodrigo “Comprido” Medeiros (8-time Mundial Medalist, two of which were Gold, and Pan-Am gold medalist). He has posted numerous Youtube videos criticizing its use in the sport, and has become somewhat of a spokesperson against it. He argues that its use is both illegal and unethical, and that practitioners will only become better through focused training; according to Comprido, marijuana will slow down your progression in the art.
Leaving aside the issue of the legality of marijuana use, in my opinion it is a bad idea to use mind-altering chemicals of any kind while training a fighting art. Some of the techniques used in BJJ can cause severe, permanent injury, and I want to ensure that my reaction time and awareness are at their maximum to avoid hurting others or myself. For the same reason, I do not drink any alcohol before training jiu jitsu (and yes, I understand that the effects of alcohol and marijuana are different, but my point remains the same).
In any case, I think the most important thing is to train responsibly, whether you use it for BJJ or not.