First, a disclaimer: I smoke, and have now for about 60 years. I don't recommend it to anyone, even though in my situation it helps me control both my temper (which can be pretty fierce) and relax a bit before I need to perform. I have not quit for several reasons, none of them really good. Smoking does not hurt my performance capability -- but I doubt that it helps much either. I also used to drink to excess; I've been sober for 30 years now. That did hurt my performing capability, sometimes drastically. It never, ever helped.
As to the notion that being high or drunk can help you learn new tricks on a skateboard -- phoey. What those two may do is remove inhibitions to the extent that you might try something you would have thought more carefully about sober, but they won't help you learn. They might help you kill yourself, but that's a minor detail.
Meth and other stimulants might help on certain tasks -- once in a while. Trouble is, they are all psychologically, if not physically, adicting.
Bottom line? Just. Don't. Do. It.
At least not without the guidance of a fully competent medical professional. There may be some cases where, as RangerX notes, a carefully chosen, evaluated and prescribed agent may help in certain specific situations, but it will always -- always -- be better if you can avoid messing up your head -- never mind your body or possibly your whole life -- with chemicals.