cigarette pack years How to Calculate Pack-Years for Smoking? Subjective history isn't enough ->

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NHS (www.nhs.uk)- Tobacco (who.int) 10 Health Effects Caused by Smoking You Didnt Know About | State of Tobacco Control | American Lung Association- Harms of Cigarette Smoking and Health Benefits of Quitting NCI (cancer.gov)- Smoking and Your Heart How Smoking Affects the Heart and Blood Vessels | NHLBI, NIH- Smoking | Quit Smoking | Effects of Smoking | MedlinePlus- How Smoking and Nicotine Damage Your Body | American Heart Association- Chapter 29 The economics of smoking ScienceDirect- Smoking and reproduction PubMed (nih.gov)- Systemic Effects of Smoking ScienceDirect- Mortality from smoking worldwidea | British Medical Bulletin | Oxford Academic (oup.com)- Smoking-related diseases: the importance of COPD: Ingenta Connect- Systematic Review: Smoking Cessation Intervention Strategies for Adults and Adults in Special Populations | Annals of Internal Medicine (acpjournals.org)- SMOKING HABITS AND CHANGES IN SMOKING HABITS AS THEY RELATE TO CHRONIC CONDITIONS AND RESPIRATORY SYMPTOMS | American Journal of Epidemiology | Oxford Academic (oup.com)