one cigarette in the non-smoker’s tray (слэш)

With their mouths slotted firmly together, lips parted just right, Ilya exhales heavily into Shane's mouth. The smoke flows between them again, filling up Shane's lungs.
The only way Shane can describe the experience is warm. Ilya's mouth is warm against his, his hand is warm where it rests on his chin, and the smoke he breathes in is warm as it fills his lungs. Ilya pulls away just enough to let him exhale out all the smoke, but Shane quickly slams their mouths back together, tongue pushing past his parted lips.
[or: Ilya shows Shane how enjoyable getting high can be.]