" is easiest. Consider a smoker who wants to quit. She needs to recognize the first sign of a craving, and where it’s likely to lead her (outside, in the cold, fumbling with a lighter). She also needs to realize that if she gives in to the craving "

― Kelly McGonigal , The Willpower Instinct: How Self-Control Works, Why It Matters, and What You Can Do to Get More of It