I think this relates a lot here, people who are well aware of their emotions may observe the effects the drugs have on them, not just when they're high/coming down but also it's affects on their day to day lives.
It made me feel superhuman. Just knowing I would score some would get me excited.
But the more I times I took it, the more I would think of the terrible comedown. It got to the point where I wouldn’t touch the stuff without having weed and xanax on me.
Finally, I just got too scared of the comedown and stopped. All for the best I suppose (though I do take low doses of adderall or modafinil very occasionally for work if I feel like I’m about to fall asleep at my desk)
That said, I don't have the same reaction to alcohol; the cravings when I regularly partake are stronger than the desire not to. I'm sure there's a whole spectrum of folks from averse to addiction, to easily addicted to anything.