Air filled the Doctor's lungs. He felt them expand, he felt the oxygen move into his bloodstream, and then when Jack moved his mouth away, the air went immediately back out.

It was not quite a breath, but it kept him alive. He struggled to nod. Quite ingenious of Jack, the Doctor would've thought to run out, grab a variety of herbs and try to cure it, but Jack treated the symptom. Treat that long enough and the drug would pass out of his system naturally.

He'd tell him how clever he was the moment he had a voice.