Addicted fits well, though you don't hear people say "holic" as a standalone word. It is usually appended to words such as alcohol (alcoholic). Dependence also fits the definition of a "-holic". For example, an alcoholic has a dependence on alcohol. Edit: Shop-a-holic and work-a-holic are acceptable ways to use "-holic". Generally it is used informally.

Hi angels, "-holic" is not originally a stand-alone element, it comes from "alcohol-ic". But we have chopped off the "alco" part and you can add it to any word to indicate a drunk-like addiction. Thus the informality of the word that Opatop pointed out. Sugarholic, chocoholic, danceaholic, etc... add in a vowel if the word doesn't already end in one: eg. workaholic. ...italkiholic! :D