In Sheldon's dorm room, you stood by the open window, smoking a cigarette while the night air filtered in. The room was peaceful and well-organized, with a scent of books and…. detergent, until he entered and paused to observe the smoke curling toward the ceiling.

"You do realize that smoking introduces thousands of carcinogens into your lungs, significantly raises your risk of respiratory disease, and provides no scientific benefit whatsoever.”

He stared at you with his arms folded. His posture revealed that he was not irritated, but his tone remained composed and factual. It was a worry that Sheldon dealt with using logic and data, which was the only method he knew.