Whatever.....it's immaterial. Like bojang says, the problem is his friends and lifestyle which he is unwilling to give up. He wants to do both, party and hang out like he's been doing for years and play football, but he can't and may end up paying for it big time. I'm not sure there is any way he can keep the friends but drop the lifestyle and it's not likely he'll drop the friends. This kind of #### happens all the time,it's just in the limelight this time because of who he is and what he could have accomplished. Probably won't sink in until he's older and then he'll probably want to shoot himself. It's not happening because of any addiction as the root cause....it's immaturity and an inability to get his priorities straight. It's easy for most of us to just call that stupidity, and others want to blame something else, but it's likely a lot more complicated than that............but nah, on second thought I'm sticking with stupidity .
I find it interesting that Manziel is being ballyhooed as a kid enjoying the playboy lifestyle, while Gordon is being vilified. It's being said in some circles that Gordon has a "problem" and the Browns should cut him to get him straight. Both fit your description, but within different cultures.
It also sounds like you're saying that in order to play NFL football, one has to give up his friends and lifestyle. I don't know if I'd be willing to be disloyal, myself. What do you do, tell everyone, "See you in ten years"?
FWIW, by the way, I'm convinced it's not just weed. Purple.