As the Doctor came in, the Dutch Tobacco Man faced the x-rays: "You see those lungs on the left? Those are normal. These ones on the right are yours if you continue smoking cigarettes. Look at it clinging to them, black and charred, taking your life expectancy with it."

"What makes them like that?" The Dutch Tobacco Man asked.

"Ash," the Doctor said. "Well, and cancer."

—Smoker Van Hookah, An Imperial Addiction