How many successful MMA fighters do drugs?
Chris Leben, Jason Mayhem Miller, Melvin Guillard, Luke Cummo, two guys I don't want to name one died from a heroin overdose(Josh Samman) the other from a cocaine related heart issue(Shane Del Rosario), etc.
I'm sure all the names I mentioned know they pissed their talent & careers away.
If Jon Jones does drugs he won't be any different.