The below is just my experience with it.
Whether you have ADHD or not, Adderall essentially causes immediate, dramatic dopamine increases in a medically controlled way. One problem with Adderall, is that it creates a sense of "reward" without having to do anything for it. You feel accomplished and happy, without having done anything specific to achieve that result. I think it can be very helpful for a small subset of the population, but for most people, they generally just really like the feeling of being on it because they get that feeling like "I just climbed a mountain", when all you did was reorganize your sock drawer.
The MAJOR problem with adderall, is that everyone will build a tolerance to it, and you will eventually need more to achieve the same result. This is particularly problematic for people with addictive personalities and will seek to increase their dosage over time. Many, many people will get a full 30 day prescription, and because they need to take more -- Will overtake their medication and run out before their refill date.
Adderall will also cause a crash and withdrawal. So your dopamine will spike, and then fall back below normal levels later that day. So the brain will say "I want more of that". Many people will say "I need it to do....XYZ", and feel it's impossible to achieve certain tasks once the medication has worn off.
Getting OFF adderall after a long time is also VERY difficult. I had a severe adderall addiction early in my 20s, which started at a small dose. I was eventually on a super high dose until I quit. It's not a drug that you'd need to go to rehab for (unlike xanax or opiods or alchohol), but if you've been taking it a long time, getting off is very, very difficult. You won't die, but you're probably going to feel depressed and lethargic.
I would never tell someone, "don't ever take it", because it CAN be very helpful for people who need it, but I'd be very careful with it. Your relationship with the drug will almost certainly change over time.
For me personally, after I quit -- It took me about 2 years for my brain to "reset" and feel normal again.