Weed has never enhanced my kickboxing, and I no longer have the money (Texas = 20$ a half ounce for Brick, Alaska = 20$ a gram for MTF, Kush, Ak, etc.), the time, or the ability to smoke now, so who knows if it would enhance my grappling (though I was high a couple times doing sprawls and some takedown defense way back when I did no-gi cross training and it didn’t improve or detract). The fact is, my sparring partners had no idea when i was or was not high, as one of them never knew I smoked and stated so when I posted on myspazz about it, and the other sparring partner knew I smoked but never could tell the difference.
If anything, weed made me more even of keel (ie., calm) and maybe a bit more relaxed, but I smoked it so long and in such quantities that I functioned at the same physical and mental levels at all times, sober or stoned, and only the creative and logical processes changed in any relateable way. I never went to work high, though. Ethically, I couldn’t bring myself to go to a retail sales job stoned. Also, ethically, I have always stated that I believe alcohol and marijuana are in the wrong classifications and should be switched, as MJ has 0 deaths by overdose per year and alcohol reports at least 4000, MJ is a contributing factor in far fewer accidents per year than alcohol (national data points to an almost 10 to 1 ratio of alcohol related accidents to marijuana related), and alcohol is so much more volatile to the system than MJ.
Now, as for other narcotics, I only have experience with Codeine syrups (Lean for those from the south), Tussinex, Promethezine, etc. and those were like being drunk but without all the nasty hangover side-effects. Otherwise, no coke, no opiates, no meth, no barbs, no X, GHB, shrooms, LSD, etc. So I can’t really tell you much about their effects, the ability to replace addiction with training, etc.
I think it’s possible to replace weed or other casual drugs (such as alcohol prior to sliding into an alcoholic state) with training if you are using them for recreation, ie. more as a pasttime than in a need/want role. Otherwise, if you’re goal is to be high at all hours of the day, everyday, I don’t think it’s going to help much. You’ll just find ways to be high AND train. I had my period of smoking right after work and until I passed out at night, when I was my bipolar worst, and all the training in the world was merely an adjunct to the herb. I trained high, running through shadowboxing, kicking drills, bagwork, even sparring stoned. But I knew guys who were so hopped up on painkillers, to combat knee or shoulder injuries, that they really didn’t feel anything short of a KO to the skull in sparring. I didn’t really think I was that bad of an apple.
Nowadays, I doubt I’d train high. whether it enhances or detracts from my performance, I’d rather not mess with the hassle you get from a public that does what the federal drug control policy (read as: NASIs, or National Association of Socialist Idiots) tells it to do, regardless of how many people in said public actually smoke or are not against smoking herb.