What is cocaine doing to me?

Im currently dealing with addiction. My last run i decided to try out cocaine because it wasent my drug of choice. First week everything was cool. Second week i noticed a problem and couldnt stop. This went on for the next 3 months until i threw myself back into rehab and sober living. They talk about an alergic reaction we get when we use drugs, that when we use we ALWAYS want more. 1 is too many and 1000 is never enough for addicts. I love drugs but i need to figure out what is causing this alergic reaction to always use more.. some say it is self control but for addicts it is more complicated than that. Just a little story on what im going through.

/r/Drugs Thread