Opiate tolerance can happen pretty quick. The limited supply though shouldn't pose any issues if you can walk away from coke (no experience personally, but I've seen others with the stuff...)
I'm scripted opiates, so I have a tolerance and a dependency. Nothing too bad, but certainly not enjoyable when you are looking at 4 pills with 7 days left to refill. Usually it isn't a problem, to refill earlier. It isn't a picnic, but with I doubt you'd feel too much after a few weeks of use.