To Smoke
To Suck, To Inhale
transitive verb, godan verb
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means suck so the verb vocab version is to suck, but it's usually used to talk about what you do to cigarettes, so a better translation I think is to smoke.
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you: You smoke too much, and that gives you cancer. You decide to sue (す) the cigarette makers.
これを最後に、きっぱりとタバコを吸うのを止めるつもりなんだ。
After this one, I’m going to quit smoking once and for all.
生まれたての赤ちゃんは、上手におっぱいが吸えないことも多い。
Newborns frequently struggle to latch on to their mothers’ nipples (to breastfeed).
鼻から息を吸い込んで、口からゆっくり出してください。鼻から息を吸うと、記憶と気分を司る脳の領域が刺激されるんですよ。
Breathe in through your nose and out slowly through your mouth. When you breathe in through your nose, you stimulate the area of your brain that controls memory and mood.