Ok well I didn't read these other comments cause these are from nikkas who never done drugs, or know anything about drugs. I actually know a LOT about drugs, down to how their atoms are comprised (seriously).
I'm a very good looking (I used to model for Abercrombie & Fitch), intelligent black dude, in college, got a job, a girlfriend who is very pretty, all that... and from time to time I'll fukk with meth.
YES nikka.. METHAMPHETAMINE.
(Smoke or snort...usually smoke now days)
I literally only use it to look at porn for 2 days straight. It has no other uses for me besides looking at porn, and in my opinion is a pretty useless drug
I also use regular amphetamine (adderall or Speed) for studying and getting shyt done every now and then.
I've tried coke once, but it was bad coke, and not sure if I felt anything.
To answer your question, I'd say if you see it getting out of hand, you need to stop. You'll find yourself using when not drinking. Then you'll find other uses for it, such as... "Oh I'll do a lil coke before this potluck dinner" , "I'll do a line before I hit the bar", "It'll be cool to do a line before I go to the movies".... Then you'll find yourself in a cycle... Also you may find yourself wanting something that hits harder... Crack cocaine.
And don't get it twisted.

If a person uses crack and has it under control, I don't judge them. I just telling you how it works.
The only reason I tried meth is because I've tried so many different types of Amphetamines and did my homework I knew Meth would be nothing for me.
Also you need to be aware your usage of cocaine is not for doing anything productive, but for "getting high" which can lead to habbit.
At least with amphetamines they make you productive and do shyt..also coke is short lived & expensive.
I say you good doing good for now... but be smart and know when to stop if you see it becoming a problem.

Also be aware cocaine is the probably one of the most cardiotoxic drugs out their, meaning everytime you do it, your chance of having a heart attack one day are increased... I don't think that shytty ass 35 minute high is worth that is it?