" the British humorist Sir A. P. Herbert nicely described the conflicting set of symptoms: “Thank heaven, I have given up smoking again!” he announced. “God! I feel fit. Homicidal, but fit. A different man. Irritable, moody, depressed, rude, nervy, perhaps; but the lungs are fine. "

― Roy F. Baumeister , Willpower: Rediscovering the Greatest Human Strength