Basically I have found iv'ing coke to be one of the biggests wastes of money. Without testing for purity obviously I have no idea of knowing how strong the product is. But over the years and the different instances where I have used, I've developed a pretty good idea of what's good and bad stuff. No one persons tolerance level is exactly the same and its a pretty well know fact that, height, weight, usage, and I speak for myself on this one, your state of mind before and after administration. Going into any drug with the thought on your mind that you might not feel it as much, or it won't be as good as it could be, this could possibly inhibit your effects.
Possibly some advice could be. Clear your mind. Keep distractions and worries away. If your hiding in a bathroom stall at work trying to rig your probably not going to enjoy your journey as much. Have a nice comfortable safe spot to do your stuff at, and try to just calm your perception that you have a tolerance, your mind is more powerful than you think. If this advice is taken seriously and better results are not achieved you might want to consider finding a friend with better stuff. In all of my IV experiences with the ole white girl, I came to the realization that initially I will feel like I turned my baggie inside out and licked it clean then a decent buzz lasting for 5-8 mins at times more, followed by an intense craving for more. I pretty much gave up on it at that point, the rush isint worth the money. If coke continues to fail you there is always meth, but only if you enjoy not eating, sleeping, and feeling like you have completely lost your mind. It's easy to find yourself staying up for nearly a week and not feel the slightest bit tired. I've been experimenting