IPA: /ˈsmoʊkər/
KK: /ˈsmoʊkər/
A person who regularly smokes tobacco or a device used for smoking food or other substances.
The restaurant has a special area for smokers to enjoy their cigarettes.
Smoker → It is formed from "smoke" (from Old English *smocian*, meaning to emit smoke) and "-er" (meaning a person who). A smoker is a person who emits smoke, typically from tobacco or other substances.
Think of someone who 'emits smoke' — that's what a smoker does, as they are a person who smokes.