The worst thing I ever did was meth. But I've only done this once. And to be honest, it wasn't nearly as bad (or addicting) as those drug PSAs make them out to be. The Nazis invented meth, just a fun fact there. But yeah, as far as the effects go, it's just an Adderall high. That's it. It doesn't impair your judgment, at least not in the same way that weed or alcohol does. In fact, if you use it only occasionally (like at parties) or even less than that, you could be high on meth around people and they wouldn't even know it. And it's not physically addictive. You can quit it cold turkey if you ever do become addicted to it, just like coke. But the downsides are that the burnout is terrible, the cottonmouth is so extreme to the point that swallowing can become difficult and you lose appetite and sleep. And some other minor things. That's why I don't see myself doing it everyday.