Cocaine has a relatively light risk profile for addiction, but many people still become addicted. Here, both chemical dependence and behavioral addiction come into play, where users first develop tolerance, then chemical dependence, and then start to use the drug for behavioral reasons. These reasons might range from preventing a crash to continuing to feel good, but will eventually result in pathological seeking behavior, where the individual loses control of their drug use.
Cocaine is a stimulant, increasing levels of dopamine and serotonin in the brain for periods of about 30 minutes, after which effects fade, unless the individual takes another dose. Individuals who frequently use build up tolerance and need more and more frequent doses to maintain the same effects. So, the longer someone uses cocaine, the more they take, and the higher their chances of addiction. In addition, cocaine withdrawal can kick in even after a few uses. However, with mild symptoms, some users attribute these withdrawal symptoms to feeling down.