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But in some cases, symptoms can last a long time

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Click image to enlarge or download Key Facts About Smoking Cigarette smoke contains more than 7,000 chemicals, at least 69 of which are known to cause cancer.2 Smoking is directly responsible for approximately 90 percent of lung cancer deaths and approximately 80 percent of deaths caused by chronic obstructive pulmonary disease (COPD), including emphysema and chronic bronchitis.1 Among adults who have ever smoked daily, 78% had smoked their first cigarette by the time they were 18 years of age, and 94% had by age 21.3 Among current smokers, 73% of their diagnosed smoking-related conditions are chronic lung diseases

I light one