I know this thread is old, but since I googled some stuff and this showed up, I felt like sharing my experience.
You said you didn't like the first time. This is normal, the 1st time I sniffed cocaine I didn't feel "the effect", I mean, you don't know what to expect so, you don't know what you'll feel.
If you have a good coke, you will definetely feel something, euphoria, talkness, more energy, you don't feel tired anymore, if you are drunk, this is gonna go away fast...
I live in Brazil, here is easy to get good coke (and it's also easy to get crap), but when you do get the great stuff, you will definetely feel it's effects.
I'm 30 now, the first time a tried it was when I was 19, back then I was a great coke head, I couldn't go out at night without it... But this was an adolescent head, thanx got I ddnt become a massive addict.
I always used a lot of drugs, but I always knew my limits and I never got caught.
Lately I've been sniffing some coke like, 1x a month, and only with a friend who has a good contact.
I can confess that nowadays the coke is better than before, good coke should give you:
Feeling of great energy
Take away drunkness (that is the main use I have for it nowadays, I like to sniff a line to get back to "normal" when I'm getting too drunk
Impotency is classic, It always happened to me. While the women go crazy to have sex, men just can't get it up. I mean, you can, but it takes a lot of effort and blowjob.
Good coke doesn't fuck up your nose, you don't need nose drops
good coke allows you to sleep, you wake up very nice the other day no hang over. Mixed coke tend to leave you awake for several hours and lead to depression, I lost count of times when I got home and took hours to sleep, heart pounding on chest (you think it's good coke but in fact it's a lot of amphetamines).
I know my limits and I know how to use drugs safely, even when I abuse.
I have a lof of friend who became slave of the drugs, so beware. You don't wanna embarasse yourself and your relatives by going to rehab.