You're altering your dopaminergic system by over stimulating it. Your neurochemical balance has been altered as a result. Have you ever noticed even people who don't do cocaine, or any other stimulant, will rub their nose like they took a bump after doing some adrenaline inducing activity. The neurotransmitters associated with reward seeking behavior are the same ones associated with doing cocaine and experiencing euphoria via adrenaline. It's only natural that the same residual tics and behaviors would emerge, since the same neurochemical environment is present.
For the record, the only time I've ever touched cocaine, I didn't know the joint had cocaine in it, I hate that feeling, and never touch the stuff as a result.
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