Luke Cummo, who is fanatical about his personal health (vegan, eats uncooked, unprepared foods only, drinks his urine)... Cummo recently pulled out of UFC Fight Night 16 - UFC Fights for the Troops - because he is currently content working full time and looking after his new son. He also had this to say about his current and future plans...
Yes, he got made fun of a lot on TUF. He also makes sure his bed is facing a certain direction, something about the sun or something. I was a bit shocked when I read this, considering how anal he is about taking care of his body.
High probability that the drug in question is marijuana, which is an herbal medicine of sorts. I don't know what else he might be able to justify using.
Is it hard for anyone else knowing that this man is a ufc fighter.. and a pretty damn good one at that.