UFC color commentator Joe Rogan believes there is a “tremendous” amount of UFC fighters who smoke marijuana.
Several months ago, the UFC announced a new out-of-competition testing program that would include a minimum of 2,750 drug tests per annum, as well as dramatically increased punishments for positive tests. While the main intention of such significant change was to undercut potential rampant use of performance enhancing substances in the UFC, the USADA program will also target other recreational drugs such as marijuana, which would likely be a problem for many UFC fighters, according to Joe Rogan.
The UFC color commentator revealed on his JRE podcast (h/t r/MMA) that he believes a "tremendous" amount of UFC fighters smoke marijuana and have to err on the side of caution several weeks ahead of their scheduled fights.