Smoke
The flame from the match lights up the tiny cell for an instant, before being drawn into a cigarette. He inhales deeply, shutting his eyes and leaning his head back against the wall.
He's sitting on the bed with his legs crossed underneath him, grateful that Sydney agreed to trade information for a match and a Silk Cut. She said she didn't know he smoked and Agent Vaughn added that he thought the cigarette brand was " queer ".
He exhales and watches the smoke disappear before closing his eyes again.
"Bloody hell."
END
I know it's unlikely that the CIA would give Sark a match but whatever.