There is a difference between smoking 5 cigarettes a day and a pack of cigarettes, but both are harmful to the body. Cigarettes contain a lot of nicotine, acetone, ammonia and other harmful components to the body, smoking will lead to the occurrence of chronic respiratory diseases, such as common chronic obstructive pulmonary disease, and at the same time will lead to the occurrence of malignant tumors, cardiovascular and cerebral vascular diseases, diabetes and so on. And the occurrence of these diseases is related to the amount of smoking, i.e. the more and longer you smoke, the greater the risk of occurrence. However, smoking 5 cigarettes a day and a pack of cigarettes are both harmful behaviors to the body, as long as smoking is harmful to health. From this perspective, there is little difference. It is recommended to quit smoking as early as possible and adopt a good lifestyle.