19. Nick Diaz
Sport (Years Played): MMA (2001-present)
Accolades: 26-8; Former Strikeforce Welterweight Champion
If there's one group of athletes who deserve a pass when it comes to a little recreational toking, it's gotta be MMA fighters. These dudes are subjected to some of the most brutal indignities in organized sports, and yet they're not allowed to get high now and again? GTFOH. One of MMA's respected and rising stars, Diaz tested positive for marijuana this past week and faces a possible suspension and fine—if he comes out of retirement. Here's hoping Diaz doesn't stay retired, and that UFC relaxes its drug policy in regards to pot.