After 15 days of not smoking, I yielded to the excuse today. After I bought a pack and lit up the first one, within few puffs I realized that I don't like it anymore. My body has found its way to recover from the addiction. I felt very bad. I threw away the pack after the first one. I'm glad I did and now I know I had spent $7 for 3 puffs of a cigerette. While the thoughts of better life style without smoking is a positive reinforcement, high cost very well acts as negative reinforcement. Next sprint starts!