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But a recent comprehensive study by the BMJ medical journal says it is not possible to determine whether they are less harmful to the respiratory system than regular cigarettes

How Many Cigarettes in a Pack of Marlboro

CNNs Val Willingham and Bill Mears contributed to this report.

Treatment options for asthma include: inhaled bronchodilators, corticosteroids, and other medications can help open up the airways avoiding triggers, such as allergens, environmental irritants, and certain foods lifestyle changes, such as increasing sleep and making dietary adjustments Smoking accounts for about Be sure to see a healthcare professional if you currently smoke or used to smoke and have any of the following symptoms: persistent cough chest pain hoarseness wheezing coughing up blood shortness of breath They can help make a diagnosis and recommend the appropriate treatment, which may include medication, lifestyle changes, or further testing, such as imaging tests or biopsy

(AP Photo/Gene J

In contrast, the Americas saw a decline from 159 million smokers in 2000 to a projected 121 million by 2030