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Retailers realized the potential in promoting e-cigarettes as a healthier choice, leading to a surge in market demand
Leaves very little moisture in the bowl
Statistical analysis Cigarette butt densities, i.e., cigarette butts per square meter, were expressed as mean standard deviation and range, from minimum to maximum
Cox regression and Kaplan-Meier analysis were performed for predictors of FVA(+SCD) and smoking or never smoking groups, respectively
Statistical analysis Principal component analysis (PCA) and Hierarchical cluster analysis (HCA) were conducted to analyze the dynamic changes in conventional chemical composition factors levels using SIMCA 14.1 software (Wu et al
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