His eyebrows shoot up as Ianto grabs it from him, then John pulls out a book of matches (branded from Shades Darker, these are work matches) and holds them out.

"Here you go," he says lightly, because clearly Ianto is in a hurry and John doesn't feel like picking apart why. "Knock yourself out."

John busies himself scanning the area for any signs of life while Ianto rolls for them, hauling his bag back onto his back and trying to think ahead. If it does give them some weird reaction, might there be another way? Should he be prepared to just wrap Ianto in a blanket and calm him down if he begins to go off the rails? For that matter, should he wait a little to see how he behaves before smoking any himself?