When will people get addicted to cocaine after they use it?

It depends on the person. Some people claim to be addicted after one use. I have used cocaine maybe 10 times a year for the last 15 years on average, more when i was younger and now it's down to maybe twice a year. I never got addicted, but I also never used it for more than one day in a row. I am an addicted smoker, so I have the addiction gene, but cocaine just never took, thankfully.

You'll know you're addicted when you're doing it regularly, be it every day or every weekend, even. Just like cigarettes. But of course by then it's too late. :)