I disagree, I've seen people who were going good places start doing drugs and turn into completely unmotivated losers (me included)... one of my good friends was an honors student, all A's, and could play basketball really well.. started smoking at 13 and his shit slowly went down the drain. Now hes 19, sells pounds of weed to help support his habit, is on probation for 2 years, dropped out of HS after he got expelled for being arrested, and works at pizza hut.
He's still my friend, and I love the guy, but it's just an example. I can't exactly say drugs have done wonderful things for me either, I used to be an honors student as well, right now I'm a 17 y/o HS drop out with 1 year of college, and I've dropped out of college too because I was too unmotivated. Hopefully that will change, and I'm not too worried about my future as I've always found a way to make things work, but I'd prolly be doing incredibly well if I hadn't started doing drugs at 13.
That said, drugs have done some pretty amazing things for me too, but not the kind of things that are going to get me anywhere in today's society. I've learned some pretty ridiculous stuff about how our world works from mind expanding psychedelic drugs like LSD, Ketamine, MDMA, and many others, and I've had some ridiculously amazing experiences - but right now that still gets me no where productive.