Don’t fool yourself: “Social” smoking is still hazardous to your health, from the Harvard Heart Letter
If you think you are doing your heart and lungs a favor by smoking only "a little," think again. Light or intermittent smoking may be safer for you than heavy smoking, but it still causes harm to the heart and body, reports the November 2010 issue of the Harvard Heart Letter.
Light and intermittent smokers often fly under the radar of doctors and others in a position to help them quit completely. When asked "Do you smoke?" they often answer "No."