complete waste of time and money imvho..
rock is kind of like doing nitrous, maybe a bit more intense, with the train whistles and ear ringing included.. very short term effect, making chasing the dragon a sure bet...
worst drug ever, again, imvho.. it's a really dirty, shitty drug, and by that, i mean the way it makes a person think, at least the way it made me think. god awful..
you can probably expect a nice headache from your racing heart rate and blood pressure, followed by a horrible come down that last a few hours is you don't take something to take the edge off.. extreme paranoia is another nice side effect of rock.. you'll be peaking out the watch hole in the door, swearing the 5-0 are coming to get you...
i agree with canndo, crack is one of those drugs with not many plus sides and many, many, many negatives, avoid at all costs, especially if you are even some what addictive personality wise..