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Factors such as these differ between countries, and over time, and thus one cannot be sure that relative risks taken from studies in different populations (geographic or temporal) would be appropriate for the UK in 2010

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E-cigarettes are developed to maximize nicotine delivery (e.g., via nicotine salts, which make high concentrations of nicotine more palatable76), and some e-cigarette brands are now owned by tobacco companies.77 , 78 E-cigarette use with nicotine may reduce harms from smoking but does not address nicotine addiction, given that nicotine may continue to be consumed long term

SOURCE SHARE Urea, the main ingredient in urine, is added to cigarettes to enhance their flavor