It is official! UFC Fighters can smoke all the weed they want. This is something that has been an issue for so long and definitely had to be changed with it becoming more and more legal across the country. So as of Jan. 1, The USADA will no longer punish athletes who test positive for marijuana, specifically THC (11-nor-9-carboxy-tetrahydrocannabinol), which is the main psychoactive ingredient in the drug. What fighter do you think is going to love this the most? Nate? Jon? Conor? Check out More Details from MMAFighting.com