cocaine has legitimate uses, there may be a need in the area based on a particular practice...
https://www.drugs.com/dosage/cocaine-topical.html
Usual Adult Dose for Local Anesthesia
Local (topical) anesthesia of accessible mucous membranes of the oral, laryngeal and nasal cavities:
Dosage varies and depends upon the area to be anesthetized, vascularity of the tissues, individual tolerance, and the technique of anesthesia. The lowest dosage needed to provide effective anesthesia should be administered, not to exceed 1 mg/kg. Topical cocaine may be administered by means of cotton applicators or packs, installed into a cavity, or as a spray.
Re Anesthesia:
And red headed people sometimes need more than others!