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Quit smoking (for the last time) on 1 September 2002

If all adult menthol smokers had quit, the expected adult smoking prevalence in 2022 would have been around 7%

The DIY base is made up of vegetable glycerin (VG) and/or propylene glycol (PG), in variable proportions

An optimal prospective observational study design would identify and follow a large cohort of smokers who want to quit or are making a quit attempt, assess e-cigarette exposure in detail before the smoking cessation outcome is assessed, biochemically confirm self-reported tobacco abstinence, and adjust for multiple potential confounding factors associated with e-cigarette use and with smoking cessation