One who is addicted to cocaine. Ralph used to be a cokeaholic, that's why he went to rehab.
foodaholic
Someone who frequently consumes food in excess. Modeled on "alcoholic." I used to be a real foodaholic, but now I'm able to control my portions much more easily.
cokeaholic
(kokəˈhɑlɪk)
n. a cocaine addict. (Drugs.) When I realized I was a cokeaholic, I decided to stop, but I couldn’t.
foodaholic
n. a glutton. Kelly is a foodaholic and has a real eating problem.