noun
nicotine addiction; heavy smoker
Slang term for a person addicted to nicotine or for the condition itself. Often used self-deprecatingly or jokingly among smokers.
See also: ニコチン中毒
彼は完全にヤニ中で、一日に二箱吸う。
He's a total nicotine addict and smokes two packs a day.
ヤニ中をやめたいけど、なかなか難しい。
I want to quit my nicotine addiction, but it's really hard.