This is best during writing.
I disagree. I find that I write better when I'm just on speed, or just stoned. But the combination really wears me out mentally. Maybe it's because I tend to go on binges with prescription stimulants, and it has to do with the lack of sleep/food, idk...
However, my favorite thing about Adderall is the clarity of thoughts and the undying motivation to do whatever the fuck I put my mind to. Weed has pretty much the opposite effects, at least for me -- and I love it for that equally. But the combo sometimes fucks up the good aspects of both drugs.
Tbh, I actually combine them weed and methylphenidate all the time. It's still a bad combination for doing shit, though. I would stick to one or the other for all academic, creative or work-related endeavors.
But there's something about a good, energizing Sativa (think Sour Diesel, for example) that always kicks off amphetamines or methylphenidate for me.
Indica weed and stimulants is a stupid combo...
Also, a funny thing is that I've never had good experiences combining weed with caffeine or cocaine. I specifically like it (sometimes/sort of) with dexmethylphenidate. I'm a very specific person in general...