cokehead       
noun [ C ]  slang (also coke-head) uk/ˈkəʊk.hed/ us/ˈkoʊk.hed/
 可卡因瘾君子
someone who uses or is addicted to cocaine (= an illegal drug)
  He's a cokehead and an alcoholic. 他是名瘾君子,也是个酒鬼。 
 I don't know why she wants to go out with that coke-head. 我不知道她为什么要和那个瘾君子交往。 
 - More examples
 - He's a self-admitted drinker and cokehead.
 - I'd rather have a conversation with a cokehead than a drunk.
 - She is a former big-time coke-head with tattoos on her arms.