There are still about 1.3 billion people smoking cigarette worldwide. Cigarette smoking is known to increase risks of chronic obstructive lung disease (COPD), lung cancer, and heart attack.
It is interesting that many smokers do not believe smoking is harmful. A study by the Department of Medicine, Harvard Medical School discovered even those who smoked more than 40 cigarettes a day did not believe that cigarettes increased risk for heart attack and cancer. Non-believers tend to be older (65 year or older), less educated (not a high school graduate), and smoking lighter (less than 20 cigarettes a day).
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