Image from Centers for Disease Control November 21 is the official Great American Smokeout Day. This is the day every year in November that all smokers are encouraged to quit smoking. Who succeeds at quitting and who doesn’t? Why can some people quit while others can’t? The answers are not that hard to understand. Everyone knows the dangers associated with smoking. It is the leading cause of preventable death in this country. It causes 480,000 deaths per year. That translates…