Kind of of the topic of golf but Weed (IMO) should stay on the PED list for MMA for one simple reason. It is a very strong bronchodilator, although it seems contradicotory at first thought. If a fighter were to get super stoned and then work on his cardio (which many fighters struggle to get to an elite level) it would be very beneficial to him. Its actually prescribed medically for asthma in some cases believe it or not.
On the topic of golf, I have a lot of experience with weed, and golf. And for me personally I play much worse, I can't stayed focused on performing my best and I eventually stop caring. But I do believe it would help some people (when used sparingly) perform at a
higher
level.
pun intended