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The act of breathing e-cigarette aerosol in and out is known as vaping

By placing a pouch inside the mouth, nicotine is absorbed through the gums, providing a similar sensation to smoking or chewing tobacco

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According to a recent World Bank working paper on electronic nicotine delivery systems, a third of the current users of e-cigarettes are nonsmokers, suggesting that they contribute to primary nicotine addiction, and the normalisation of tobacco use

The Metafor package is advantageous because it allows such mixed-effects models to be fitted with continuous or categorical x moderator variables, compared to previous packages that only allow categorical moderator variables to be fitted