Well, for starters, we don't know much about you, so it's hard to say whether other IV coke users are "like" you. Also depends what your definition of "high functioning" is. If you are holding down a job that covers your living expenses and permits you to buy and shoot cola from time to time, then I suppose there are others like you.
What I'm wondering though is how long have you been shooting coke, and in what quantities. My progression with IV coke was very gradual until it was not. Occasional use turned into once a month, to once a week, to two or three times a week, spending all my free time driving up and down the highway to score, prepping and shooting coke until it was gone, then crashing for the better part of a day until I felt half normal.
Once I was at that point, the habit was impossible for me to break by myself and I went to a 30 day rehab. I have used IV coke since then (2006) but never let it become a habit.
Be careful if you are new to this, because it can and will sneak up on you, and all the sudden your life revolves around it, and the "high-functioning" you elude to becomes a distant memory.
Be safe. Have fun.
FC