<human>:  Can you tell me the most common health problems for cigarette smokers?
<bot>: Cigarette smoking has been shown to cause a variety of illnesses, including lung cancer, heart disease, stroke, and emphysema. The most common adverse health effects include cough, phlegm, mucus production, wheezing, shortness of breath, and tiredness. These effects may cause more trouble when you smoke while sleeping, which may keep you from getting good rest.