Lynch, PhD, Dan Romer, PhD, and Caryn Lerman, PhD, of the Department of Psychiatry at Penn Medicine, and Joseph N
Among studies including only two time points that addressed smoking progression, those that did not eliminate baseline ever smokers and used an alternate strategy for addressing reverse causation (e.g., statistical adjustment of baseline combustible tobacco use, elimination of baseline current combustible tobacco users without eliminating baseline past combustible tobacco users) were considered to provide less robust evidence of temporal precedence of an association of e-cigarette use with smoking progression (Etter, 2017)
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Symptoms to watch for alongside dark mucus include: Fever Shortness of breath Chest pain Fatigue Chronic Lung Conditions Some long-term lung conditions, like COPD, bronchiectasis, or cystic fibrosis, can cause your body to produce thick, brown mucus
