is it ok to smoke 5 cigarettes a day new study supported by the American Heart Association's Tobacco Center for Regulatory Science has revealed a stark truth — even light smoking isn't safe. Researchers tracked more than 320,000 adults over Single cigarette takes 20 minutes

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All authors have completed and submitted the International Committee of Medical Journal Editors form for disclosure of potential conflicts of interest

Just 1.5% of smokers were using e-cigarettes daily (0.8% of ex-smokers and 0.2% of never smokers)

Including fibroblasts or other mesenchymal cell populations in co-culture models could be crucial for studying smoke-induced effects, as these cells contribute to extracellular matrix remodeling, fibrosis, and epithelial-mesenchymal interactions, which are key processes in COPD and emphysema progression