Let's see...
I smoke some weed occasionally, I don't really ever get high or anything unless it's laced with hash or it's a medical product.
I was addicted to crystal meth throughout my whole tenth grade year in high school...that was some pretty bad stuff; it was the first time I was truly addicted to anything. It's been about 7 years since, and I'll definitely never do that again.
I've also tried ecstasy one time...I ended up staying up the whole night. Ecstasy was a lot like taking meth except much stronger and longer lasting. Some people tell me that ecstasy
IS a form of meth, but I've never done my research to see if it's true or not.
My friends and I recently tried acid too. It made us all act stupid as hell. It also made us fairly paranoid; I remember thinking every car behind me was a cop car. And of course it made us trip like we've never tripped before. Everything was breathing and melting.
And the most recent drug I've tried is cocaine. Coke is pretty interesting. It'll make your heart beat fast and you'll feel happy and completely euphoric, as if nothing in the world matters and all you wanna do is just continue feeling good. But the high will only last for 20 to 30 minutes, and then there's the "come down". Coming down off of coke could be very different depending on how pure the product is. If it wasn't that pure, coming down could make you despondent and depressed. Pure cocaine will leave you feeling normal and not so depressed when coming down.
For the record I've never shot anything up. I'll never do that. Sniffing powdered drugs is where I draw the line

FYI: Everything I just talked about is based on my own personal experiences with these drugs. For all I know, it could be different for other people.