Poisoning, Addiction
noun, verbal noun
You're in the middle of poison, meaning you have poisoning.
ちゅうどく
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
彼は食物中毒により入院することになりました。
He ended up hospitalized due to food poisoning.
ガス中毒にならないよう気を付けてくださいね。
Be careful not to get gas poisoning.
彼女は薬物中毒のリハビリ中です。
She's undergoing rehab for drug addiction.