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Krist, MD, MPH (Fairfax Family Practice Residency, Fairfax, Virginia, and Virginia Commonwealth University, Richmond)

[124] The power source is the biggest component of an e-cigarette, [19] which is frequently a rechargeable lithium-ion battery

Missing data Missing data in the covariates and mediators (Supplementary Figure S1), representing 14.2% of the dataset, were imputed using the missForest package in R, a nonparametric method based on random forests, and the imputed dataset was used for all association analyses

It was only in 1935 that a machine for the automatic production of filter cigarettes was invented by English engineers and the mass production of filter cigarettes became possible