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Marketed as a smoking cessation device, the flavor and feel of e-cigs mimic regular cigarettes and allow users to progress over time to formulas that deliver lower and lower doses of nicotine

This responsibility weighs on them and helps account for the psychological and emotional difficulties they often experience

Rules vary by state and city

Accessed 30 August 2021 International Organization for Standardization standard Indoor airPart 3:Determination of formaldehyde and other carbonyl compounds in indoor air and test chamber airActive sampling method

Sometimes it is necessary to use ventilators to help them when they have a crisis