One who habitually uses opium in some form as a stimulant.(noun)
The Century Dictionary (Public Domain)
Use "opium-eater" in a sentence
"“What queer business are you up to?” asked Lousteau of the artist, an opium-eater who dwelt among visions of enchanted palaces till he either could not or would not create."
"Common were forms and colors of bird, and fish, and butterfly, more strange and bright than ever opium-eater dreamed."
"Becky loved society and, indeed, could no more exist without it than an opium-eater without his dram, and she was happy enough at the period of her boarding-house life."