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Cardiovascular mortality and exposure to airborne fine particulate matter and cigarette smoke shape of the exposure-response relationship

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Researchers pooled data from 141 studies done in 21 countries and regions, together involving millions of people

As an editorial accompanying the study notes, "Light smoking, occasional smoking, and smoking fewer cigarettes all carry substantial risk of cardiovascular disease." To protect your heart, just cutting back won't cut it you need to quit completely

8 Just 12 hours after quitting smoking, the carbon monoxide level in your blood drops to normal, allowing more oxygen to vital organs like your heart