In my experience cocaine snorted is a hell of a lot of fun. But doing just a little too much is really unpleasant. It can make you feel extremely tense, worried, and panicky. The good thing about it is if you snort too much, just stop snorting it, maybe have a beer. As long as you do small lines no less than twenty minutes apart and stop when you feel more on edge than euphoric you'll have a good time.
I've never shot coke myself, but I knew a guy who's dad liked to shoot it. He was fifty and looked seventy five, he was bat-shit nuts and mean as a hornet, he was six foot two and weighed 125 lbs soaking wet, he smelled like garbage and lighter fluid, and he died when he tried to rob his dealer because he was broke (a year earlier he was an accountant for a fortune 500 company), and his dealer, disgusted with him and knowing he was out of money, shot him up and intentionally overdosed him. Having known the man I think his dealer did him a favor.
The moral is, snort it man.