This is the 9478th most frequent Turkish word.
akciğerlerine
"To his/her/its lungs"
In this sentence, "akciğerlerine" is used to indicate possession and location, meaning "to (or into) their lungs."
Sigara dumanı akciğerlerine zarar verebilir.
Cigarette smoke can damage your lungs.
Here, "akciğerlerine" specifies the destination of the air, emphasizing the entry into their lungs.
Koşarken soğuk hava akciğerlerine doldu.
Cold air filled their lungs while running.
In this context, "akciğerlerine" expresses the target of the action, denoting the lungs as the recipient of the air being pumped.